{"title":"Grammas, Basslets \u0026 Assessors","description":"\u003cp\u003eGrammas, basslets, assessors and the marine betta — cave-loving reef fish that add colour to the shadowy parts of the rockwork. All fully reef-safe.\u003c\/p\u003e","products":[{"product_id":"blackcap-basslet-gramma-melacara","title":"Blackcap Basslet | Gramma melacara","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\u003cp\u003eDeep purple topped with a black cap, the Blackcap Basslet is an elegant, cave-loving fish that hovers near ledges and overhangs. Peaceful, reef safe and a touch more unusual than its Royal cousin.\u003c\/p\u003e\u003ch2\u003eNatural Habitat\u003c\/h2\u003e\u003cp\u003eThis species naturally occurs around shaded reef walls, overhangs and crevices where it can retreat quickly from open water. It favours stable, clean reef conditions and appreciates a secure cave network in captivity. Its natural range is Deep reef ledges and caves of the tropical western Atlantic and Caribbean. These fish are closely associated with rock, coral bases, ledges or cave openings, so they feel safest in aquariums with layered aquascaping and multiple retreat points. Open, bare tanks can make them nervous or overly defensive, while a structured reef gives them clear boundaries and reduces stress.\u003c\/p\u003e\u003ch2\u003eAppearance\u003c\/h2\u003e\u003cp\u003eBlackcap Basslet has the body shape and behaviour expected from its group, with quick movement, alert eyes and a preference for staying near shelter. Colour and markings are species-specific, but healthy specimens should show clear fins, strong body condition and confident feeding. The adult size is generally 8–10 cm, making this species suitable for carefully planned marine aquariums where space and tank mates are considered.\u003c\/p\u003e\u003ch2\u003eTemperament and Compatibility\u003c\/h2\u003e\u003cp\u003eTemperament is best described as Peaceful to moderately territorial around caves. Grammas and assessors are usually more peaceful cave dwellers, while many dottybacks can be bold and territorial despite their small size. Suitable tank mates include clownfish, cardinalfish, gobies, blennies, peaceful wrasse, chromis and appropriately sized tangs in larger systems. Avoid adding this fish to tanks dominated by large predators or very aggressive damsels, and avoid mixing similar dottybacks unless the aquarium is large with plenty of broken rockwork.\u003c\/p\u003e\u003ch2\u003eFeeding\u003c\/h2\u003e\u003cp\u003eThis species should be fed as a Carnivore; frozen mysis, enriched brine shrimp, finely chopped seafood, copepods and quality marine pellets. Offer small portions once or twice daily and vary the diet to maintain colour, body weight and immune strength. Frozen mysis shrimp is an excellent staple, while enriched brine shrimp can help new arrivals begin feeding. Small sinking pellets or finely chopped seafood are useful once the fish is settled. Because these fish often feed close to rockwork, ensure food reaches their territory rather than being taken only by faster open-water swimmers.\u003c\/p\u003e\u003ch2\u003eCare Requirements\u003c\/h2\u003e\u003cp\u003eProvide a minimum aquarium size of 120 L, with 180 L or larger recommended for long-term comfort or community setups. Maintain temperature at 24–27°C, pH 8.1–8.4 and salinity 1.024–1.026. Moderate water flow is ideal, with calmer pockets near caves. Lighting can match the reef system, but shaded retreats are important. Use strong biological filtration, a quality protein skimmer and regular water changes of 10–20% as needed to keep nitrate and phosphate stable. Aquascaping should include caves, overhangs and visual barriers. This fish does not school and is usually kept singly unless a known compatible pair is supplied.\u003c\/p\u003e\u003ch2\u003eBreeding\u003c\/h2\u003e\u003cp\u003eBreeding is possible but uncommon in normal display aquariums. Like other grammas, pairs may use a cave or crevice as a nest site, but rearing larvae requires specialised planktonic foods. In many cave-dwelling marine fish, spawning behaviour involves cleaning a protected surface or nest site and defending the area. Larval rearing is rarely simple because fry require very small live foods, stable water and separate rearing systems. Most hobbyists should focus on providing stable care and watching for natural courtship behaviour rather than expecting easy breeding in a display tank.\u003c\/p\u003e\u003ch2\u003eSpecies Information\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eScientific Name\u003c\/td\u003e\n\u003ctd\u003eGramma melacara\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommon Name\u003c\/td\u003e\n\u003ctd\u003eBlackcap Basslet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eDeep reef ledges and caves of the tropical western Atlantic and Caribbean\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Size\u003c\/td\u003e\n\u003ctd\u003e8–10 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLifespan\u003c\/td\u003e\n\u003ctd\u003e5–8 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperament\u003c\/td\u003e\n\u003ctd\u003ePeaceful to moderately territorial around caves\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDifficulty\u003c\/td\u003e\n\u003ctd\u003eIntermediate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Tank Size\u003c\/td\u003e\n\u003ctd\u003e120 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Tank Size\u003c\/td\u003e\n\u003ctd\u003e180 L or larger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiet\u003c\/td\u003e\n\u003ctd\u003eCarnivore; frozen mysis, enriched brine shrimp, finely chopped seafood, copepods and quality marine pellets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Temperature\u003c\/td\u003e\n\u003ctd\u003e24–27°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003epH Range\u003c\/td\u003e\n\u003ctd\u003e8.1–8.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGH Range\u003c\/td\u003e\n\u003ctd\u003eNot applicable for marine aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSalinity\u003c\/td\u003e\n\u003ctd\u003e1.024–1.026\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuitable For\u003c\/td\u003e\n\u003ctd\u003eMarine aquariums, reef aquariums and fish-only systems with suitable tank mates\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReef Safe\u003c\/td\u003e\n\u003ctd\u003eYes, reef safe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlant Safe\u003c\/td\u003e\n\u003ctd\u003eNot applicable for marine aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eSuitable Tank Mates\u003c\/h2\u003e\u003cp\u003eSuitable tank mates include peaceful clownfish, cardinalfish, gobies, blennies, peaceful wrasse, chromis, assessors, grammas, small tangs in larger systems and robust reef-safe invertebrates. Choose tank mates that are not small enough to be bullied and not aggressive enough to trap the fish away from food.\u003c\/p\u003e\u003ch2\u003eAvoid Keeping With\u003c\/h2\u003e\u003cp\u003eAvoid keeping with large predatory fish, aggressive triggers, lionfish, groupers, highly aggressive damsels, multiple similar dottybacks in small aquariums, delicate timid fish that cannot compete for food, and very small ornamental shrimp if the species is known to be predatory.\u003c\/p\u003e","brand":"Nick's Aquarium Oceanarium Terrarium","offers":[{"title":"Small (1-5cm)","offer_id":55351894868259,"sku":null,"price":390.95,"currency_code":"AUD","in_stock":false},{"title":"Medium (5-10cm)","offer_id":55226959724835,"sku":"AA3245","price":449.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/Black_Cap_Basslet_Gramma_melacara_50dc9df3-f3b9-4199-a391-36f908ecee73.jpg?v=1781681142"},{"product_id":"blue-assessor-assessor-macneilli","title":"Blue Assessor | Assessor macneilli","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\u003cp\u003eOften seen hanging upside down under ledges, the Blue Assessor is a calm, deep-blue little fish with bags of character. Peaceful and reef safe, it suits a tank with caves to call home.\u003c\/p\u003e\u003ch2\u003eNatural Habitat\u003c\/h2\u003e\u003cp\u003eBlue Assessors are associated with shaded reef caves, undercuts and coral overhangs. They often hover upside down or at odd angles under ledges, making them especially interesting in well-aquascaped reef tanks. Its natural range is Coral Sea and Great Barrier Reef cave zones, overhangs and shaded reef faces. These fish are closely associated with rock, coral bases, ledges or cave openings, so they feel safest in aquariums with layered aquascaping and multiple retreat points. Open, bare tanks can make them nervous or overly defensive, while a structured reef gives them clear boundaries and reduces stress.\u003c\/p\u003e\u003ch2\u003eAppearance\u003c\/h2\u003e\u003cp\u003eBlue Assessor has the body shape and behaviour expected from its group, with quick movement, alert eyes and a preference for staying near shelter. Colour and markings are species-specific, but healthy specimens should show clear fins, strong body condition and confident feeding. The adult size is generally 5–6 cm, making this species suitable for carefully planned marine aquariums where space and tank mates are considered.\u003c\/p\u003e\u003ch2\u003eTemperament and Compatibility\u003c\/h2\u003e\u003cp\u003eTemperament is best described as Peaceful and shy to moderately confident once settled. Grammas and assessors are usually more peaceful cave dwellers, while many dottybacks can be bold and territorial despite their small size. Suitable tank mates include clownfish, cardinalfish, gobies, blennies, peaceful wrasse, chromis and appropriately sized tangs in larger systems. Avoid adding this fish to tanks dominated by large predators or very aggressive damsels, and avoid mixing similar dottybacks unless the aquarium is large with plenty of broken rockwork.\u003c\/p\u003e\u003ch2\u003eFeeding\u003c\/h2\u003e\u003cp\u003eThis species should be fed as a Small carnivore; copepods, frozen mysis, enriched brine shrimp, finely chopped seafood and small marine pellets. Offer small portions once or twice daily and vary the diet to maintain colour, body weight and immune strength. Frozen mysis shrimp is an excellent staple, while enriched brine shrimp can help new arrivals begin feeding. Small sinking pellets or finely chopped seafood are useful once the fish is settled. Because these fish often feed close to rockwork, ensure food reaches their territory rather than being taken only by faster open-water swimmers.\u003c\/p\u003e\u003ch2\u003eCare Requirements\u003c\/h2\u003e\u003cp\u003eProvide a minimum aquarium size of 75 L, with 120 L or larger recommended for long-term comfort or community setups. Maintain temperature at 24–27°C, pH 8.1–8.4 and salinity 1.024–1.026. Moderate water flow is ideal, with calmer pockets near caves. Lighting can match the reef system, but shaded retreats are important. Use strong biological filtration, a quality protein skimmer and regular water changes of 10–20% as needed to keep nitrate and phosphate stable. Aquascaping should include caves, overhangs and visual barriers. This fish does not school and is usually kept singly unless a known compatible pair is supplied.\u003c\/p\u003e\u003ch2\u003eBreeding\u003c\/h2\u003e\u003cp\u003eCaptive spawning has been achieved by experienced keepers. Pairs may use a protected cave area, but larval rearing requires specialist foods and excellent water quality. In many cave-dwelling marine fish, spawning behaviour involves cleaning a protected surface or nest site and defending the area. Larval rearing is rarely simple because fry require very small live foods, stable water and separate rearing systems. Most hobbyists should focus on providing stable care and watching for natural courtship behaviour rather than expecting easy breeding in a display tank.\u003c\/p\u003e\u003ch2\u003eSpecies Information\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eScientific Name\u003c\/td\u003e\n\u003ctd\u003eAssessor macneilli\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommon Name\u003c\/td\u003e\n\u003ctd\u003eBlue Assessor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eCoral Sea and Great Barrier Reef cave zones, overhangs and shaded reef faces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Size\u003c\/td\u003e\n\u003ctd\u003e5–6 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLifespan\u003c\/td\u003e\n\u003ctd\u003e4–7 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperament\u003c\/td\u003e\n\u003ctd\u003ePeaceful and shy to moderately confident once settled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDifficulty\u003c\/td\u003e\n\u003ctd\u003eBeginner to intermediate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Tank Size\u003c\/td\u003e\n\u003ctd\u003e75 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Tank Size\u003c\/td\u003e\n\u003ctd\u003e120 L or larger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiet\u003c\/td\u003e\n\u003ctd\u003eSmall carnivore; copepods, frozen mysis, enriched brine shrimp, finely chopped seafood and small marine pellets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Temperature\u003c\/td\u003e\n\u003ctd\u003e24–27°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003epH Range\u003c\/td\u003e\n\u003ctd\u003e8.1–8.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGH Range\u003c\/td\u003e\n\u003ctd\u003eNot applicable for marine aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSalinity\u003c\/td\u003e\n\u003ctd\u003e1.024–1.026\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuitable For\u003c\/td\u003e\n\u003ctd\u003eMarine aquariums, reef aquariums and fish-only systems with suitable tank mates\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReef Safe\u003c\/td\u003e\n\u003ctd\u003eYes, reef safe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlant Safe\u003c\/td\u003e\n\u003ctd\u003eNot applicable for marine aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eSuitable Tank Mates\u003c\/h2\u003e\u003cp\u003eSuitable tank mates include peaceful clownfish, cardinalfish, gobies, blennies, peaceful wrasse, chromis, assessors, grammas, small tangs in larger systems and robust reef-safe invertebrates. Choose tank mates that are not small enough to be bullied and not aggressive enough to trap the fish away from food.\u003c\/p\u003e\u003ch2\u003eAvoid Keeping With\u003c\/h2\u003e\u003cp\u003eAvoid keeping with large predatory fish, aggressive triggers, lionfish, groupers, highly aggressive damsels, multiple similar dottybacks in small aquariums, delicate timid fish that cannot compete for food, and very small ornamental shrimp if the species is known to be predatory.\u003c\/p\u003e","brand":"Nick's Aquarium Oceanarium Terrarium","offers":[{"title":"Small (1-5cm)","offer_id":55351894901027,"sku":null,"price":65.0,"currency_code":"AUD","in_stock":false},{"title":"Medium (5-10cm)","offer_id":55226959921443,"sku":"AA1985","price":65.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/Blue_Assessor_Assessor_macneilli_7437747f-41c1-48de-a68c-e5a584489031.jpg?v=1781681143"},{"product_id":"royal-gramma-gramma-loreto","title":"Royal Gramma | Gramma loreto","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\u003cp\u003eOn Caribbean reefs the Royal Gramma tucks under ledges and hovers near cave mouths. That same shelter-loving habit makes it one of the easiest, most peaceful splashes of purple and gold you can add to a reef.\u003c\/p\u003e\u003ch2\u003eNatural Habitat\u003c\/h2\u003e\u003cp\u003eRoyal Grammas live around vertical reef faces, cave mouths and shaded ledges. They naturally spend time close to shelter and may hover near a chosen crevice. Its natural range is Caribbean reef slopes, caves, overhangs and shaded ledges. These fish are closely associated with rock, coral bases, ledges or cave openings, so they feel safest in aquariums with layered aquascaping and multiple retreat points. Open, bare tanks can make them nervous or overly defensive, while a structured reef gives them clear boundaries and reduces stress.\u003c\/p\u003e\u003ch2\u003eAppearance\u003c\/h2\u003e\u003cp\u003eRoyal Gramma has the body shape and behaviour expected from its group, with quick movement, alert eyes and a preference for staying near shelter. Colour and markings are species-specific, but healthy specimens should show clear fins, strong body condition and confident feeding. The adult size is generally 7–8 cm, making this species suitable for carefully planned marine aquariums where space and tank mates are considered.\u003c\/p\u003e\u003ch2\u003eTemperament and Compatibility\u003c\/h2\u003e\u003cp\u003eTemperament is best described as Peaceful to mildly territorial around caves. Grammas and assessors are usually more peaceful cave dwellers, while many dottybacks can be bold and territorial despite their small size. Suitable tank mates include clownfish, cardinalfish, gobies, blennies, peaceful wrasse, chromis and appropriately sized tangs in larger systems. Avoid adding this fish to tanks dominated by large predators or very aggressive damsels, and avoid mixing similar dottybacks unless the aquarium is large with plenty of broken rockwork.\u003c\/p\u003e\u003ch2\u003eFeeding\u003c\/h2\u003e\u003cp\u003eThis species should be fed as a Carnivore; frozen mysis, enriched brine shrimp, copepods, chopped seafood and small marine pellets. Offer small portions once or twice daily and vary the diet to maintain colour, body weight and immune strength. Frozen mysis shrimp is an excellent staple, while enriched brine shrimp can help new arrivals begin feeding. Small sinking pellets or finely chopped seafood are useful once the fish is settled. Because these fish often feed close to rockwork, ensure food reaches their territory rather than being taken only by faster open-water swimmers.\u003c\/p\u003e\u003ch2\u003eCare Requirements\u003c\/h2\u003e\u003cp\u003eProvide a minimum aquarium size of 100 L, with 150 L or larger recommended for long-term comfort or community setups. Maintain temperature at 24–27°C, pH 8.1–8.4 and salinity 1.024–1.026. Moderate water flow is ideal, with calmer pockets near caves. Lighting can match the reef system, but shaded retreats are important. Use strong biological filtration, a quality protein skimmer and regular water changes of 10–20% as needed to keep nitrate and phosphate stable. Aquascaping should include caves, overhangs and visual barriers. This fish does not school and is usually kept singly unless a known compatible pair is supplied.\u003c\/p\u003e\u003ch2\u003eBreeding\u003c\/h2\u003e\u003cp\u003ePairs may spawn in caves and the male may guard a nest, but raising larvae is difficult and rarely attempted in standard home aquariums. In many cave-dwelling marine fish, spawning behaviour involves cleaning a protected surface or nest site and defending the area. Larval rearing is rarely simple because fry require very small live foods, stable water and separate rearing systems. Most hobbyists should focus on providing stable care and watching for natural courtship behaviour rather than expecting easy breeding in a display tank.\u003c\/p\u003e\u003ch2\u003eSpecies Information\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eScientific Name\u003c\/td\u003e\n\u003ctd\u003eGramma loreto\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommon Name\u003c\/td\u003e\n\u003ctd\u003eRoyal Gramma\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eCaribbean reef slopes, caves, overhangs and shaded ledges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Size\u003c\/td\u003e\n\u003ctd\u003e7–8 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLifespan\u003c\/td\u003e\n\u003ctd\u003e5–8 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperament\u003c\/td\u003e\n\u003ctd\u003ePeaceful to mildly territorial around caves\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDifficulty\u003c\/td\u003e\n\u003ctd\u003eBeginner to intermediate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Tank Size\u003c\/td\u003e\n\u003ctd\u003e100 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Tank Size\u003c\/td\u003e\n\u003ctd\u003e150 L or larger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiet\u003c\/td\u003e\n\u003ctd\u003eCarnivore; frozen mysis, enriched brine shrimp, copepods, chopped seafood and small marine pellets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Temperature\u003c\/td\u003e\n\u003ctd\u003e24–27°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003epH Range\u003c\/td\u003e\n\u003ctd\u003e8.1–8.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGH Range\u003c\/td\u003e\n\u003ctd\u003eNot applicable for marine aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSalinity\u003c\/td\u003e\n\u003ctd\u003e1.024–1.026\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuitable For\u003c\/td\u003e\n\u003ctd\u003eMarine aquariums, reef aquariums and fish-only systems with suitable tank mates\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReef Safe\u003c\/td\u003e\n\u003ctd\u003eYes, reef safe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlant Safe\u003c\/td\u003e\n\u003ctd\u003eNot applicable for marine aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eSuitable Tank Mates\u003c\/h2\u003e\u003cp\u003eSuitable tank mates include peaceful clownfish, cardinalfish, gobies, blennies, peaceful wrasse, chromis, assessors, grammas, small tangs in larger systems and robust reef-safe invertebrates. Choose tank mates that are not small enough to be bullied and not aggressive enough to trap the fish away from food.\u003c\/p\u003e\u003ch2\u003eAvoid Keeping With\u003c\/h2\u003e\u003cp\u003eAvoid keeping with large predatory fish, aggressive triggers, lionfish, groupers, highly aggressive damsels, multiple similar dottybacks in small aquariums, delicate timid fish that cannot compete for food, and very small ornamental shrimp if the species is known to be predatory.\u003c\/p\u003e","brand":"Nick's Aquarium Oceanarium Terrarium","offers":[{"title":"Small (1-5cm)","offer_id":55351895032099,"sku":null,"price":225.0,"currency_code":"AUD","in_stock":false},{"title":"Medium (5-10cm)","offer_id":55226960085283,"sku":"AA1999","price":225.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/Royal_Gramma_Gramma_loreto_1db78751-2465-49e4-aa43-304718a0bc39.jpg?v=1781681145"},{"product_id":"yellow-assessor-assessor-flavissimus","title":"Yellow Assessor | Assessor flavissimus","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\u003cp\u003eBright yellow and often hovering upside down beneath ledges, the Yellow Assessor is a peaceful, charming oddball. Reef safe and ideal for a calm tank with plenty of caves.\u003c\/p\u003e\u003ch2\u003eNatural Habitat\u003c\/h2\u003e\u003cp\u003eYellow Assessors are found in shaded caves, overhangs and ledges where they often hover upside down or at unusual angles beneath the rockwork. Its natural range is Great Barrier Reef, Coral Sea and western Pacific shaded reef caves. These fish are closely associated with rock, coral bases, ledges or cave openings, so they feel safest in aquariums with layered aquascaping and multiple retreat points. Open, bare tanks can make them nervous or overly defensive, while a structured reef gives them clear boundaries and reduces stress.\u003c\/p\u003e\u003ch2\u003eAppearance\u003c\/h2\u003e\u003cp\u003eYellow Assessor has the body shape and behaviour expected from its group, with quick movement, alert eyes and a preference for staying near shelter. Colour and markings are species-specific, but healthy specimens should show clear fins, strong body condition and confident feeding. The adult size is generally 5–6 cm, making this species suitable for carefully planned marine aquariums where space and tank mates are considered.\u003c\/p\u003e\u003ch2\u003eTemperament and Compatibility\u003c\/h2\u003e\u003cp\u003eTemperament is best described as Peaceful and shy to moderately confident. Grammas and assessors are usually more peaceful cave dwellers, while many dottybacks can be bold and territorial despite their small size. Suitable tank mates include clownfish, cardinalfish, gobies, blennies, peaceful wrasse, chromis and appropriately sized tangs in larger systems. Avoid adding this fish to tanks dominated by large predators or very aggressive damsels, and avoid mixing similar dottybacks unless the aquarium is large with plenty of broken rockwork.\u003c\/p\u003e\u003ch2\u003eFeeding\u003c\/h2\u003e\u003cp\u003eThis species should be fed as a Small carnivore; copepods, mysis, enriched brine shrimp, finely chopped seafood and small pellets. Offer small portions once or twice daily and vary the diet to maintain colour, body weight and immune strength. Frozen mysis shrimp is an excellent staple, while enriched brine shrimp can help new arrivals begin feeding. Small sinking pellets or finely chopped seafood are useful once the fish is settled. Because these fish often feed close to rockwork, ensure food reaches their territory rather than being taken only by faster open-water swimmers.\u003c\/p\u003e\u003ch2\u003eCare Requirements\u003c\/h2\u003e\u003cp\u003eProvide a minimum aquarium size of 75 L, with 120 L or larger recommended for long-term comfort or community setups. Maintain temperature at 24–27°C, pH 8.1–8.4 and salinity 1.024–1.026. Moderate water flow is ideal, with calmer pockets near caves. Lighting can match the reef system, but shaded retreats are important. Use strong biological filtration, a quality protein skimmer and regular water changes of 10–20% as needed to keep nitrate and phosphate stable. Aquascaping should include caves, overhangs and visual barriers. This fish does not school and is usually kept singly unless a known compatible pair is supplied.\u003c\/p\u003e\u003ch2\u003eBreeding\u003c\/h2\u003e\u003cp\u003eCaptive breeding has been achieved by specialist breeders. In display tanks, pairs may show courtship, but larval rearing needs dedicated food cultures. In many cave-dwelling marine fish, spawning behaviour involves cleaning a protected surface or nest site and defending the area. Larval rearing is rarely simple because fry require very small live foods, stable water and separate rearing systems. Most hobbyists should focus on providing stable care and watching for natural courtship behaviour rather than expecting easy breeding in a display tank.\u003c\/p\u003e\u003ch2\u003eSpecies Information\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eScientific Name\u003c\/td\u003e\n\u003ctd\u003eAssessor flavissimus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommon Name\u003c\/td\u003e\n\u003ctd\u003eYellow Assessor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eGreat Barrier Reef, Coral Sea and western Pacific shaded reef caves\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Size\u003c\/td\u003e\n\u003ctd\u003e5–6 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLifespan\u003c\/td\u003e\n\u003ctd\u003e4–7 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperament\u003c\/td\u003e\n\u003ctd\u003ePeaceful and shy to moderately confident\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDifficulty\u003c\/td\u003e\n\u003ctd\u003eBeginner to intermediate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Tank Size\u003c\/td\u003e\n\u003ctd\u003e75 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Tank Size\u003c\/td\u003e\n\u003ctd\u003e120 L or larger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiet\u003c\/td\u003e\n\u003ctd\u003eSmall carnivore; copepods, mysis, enriched brine shrimp, finely chopped seafood and small pellets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Temperature\u003c\/td\u003e\n\u003ctd\u003e24–27°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003epH Range\u003c\/td\u003e\n\u003ctd\u003e8.1–8.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGH Range\u003c\/td\u003e\n\u003ctd\u003eNot applicable for marine aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSalinity\u003c\/td\u003e\n\u003ctd\u003e1.024–1.026\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuitable For\u003c\/td\u003e\n\u003ctd\u003eMarine aquariums, reef aquariums and fish-only systems with suitable tank mates\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReef Safe\u003c\/td\u003e\n\u003ctd\u003eYes, reef safe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlant Safe\u003c\/td\u003e\n\u003ctd\u003eNot applicable for marine aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eSuitable Tank Mates\u003c\/h2\u003e\u003cp\u003eSuitable tank mates include peaceful clownfish, cardinalfish, gobies, blennies, peaceful wrasse, chromis, assessors, grammas, small tangs in larger systems and robust reef-safe invertebrates. Choose tank mates that are not small enough to be bullied and not aggressive enough to trap the fish away from food.\u003c\/p\u003e\u003ch2\u003eAvoid Keeping With\u003c\/h2\u003e\u003cp\u003eAvoid keeping with large predatory fish, aggressive triggers, lionfish, groupers, highly aggressive damsels, multiple similar dottybacks in small aquariums, delicate timid fish that cannot compete for food, and very small ornamental shrimp if the species is known to be predatory.\u003c\/p\u003e","brand":"Nick's Aquarium Oceanarium Terrarium","offers":[{"title":"Small (1-5cm)","offer_id":55351895851299,"sku":null,"price":79.95,"currency_code":"AUD","in_stock":false},{"title":"Medium (5-10cm)","offer_id":55226960314659,"sku":"AA1984","price":89.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/Yellow_Assessor_Assessor_flavissimus_805e52fd-a4bd-4fd2-8f8b-3b52607f194f.png?v=1781681145"},{"product_id":"marine-betta-calloplesiops-altivelis","title":"Marine Betta | Calloplesiops altivelis","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\u003cp\u003eSpangled in white spots with a false eyespot on the tail, the Marine Betta drifts gracefully from the rocks like nothing else in the hobby. Peaceful but predatory, so house it with fish too big to swallow.\u003c\/p\u003e\u003ch2\u003eNatural Habitat\u003c\/h2\u003e\u003cp\u003eMarine Bettas live around shaded reef caves and overhangs where they use darkness and patterning to avoid attention while waiting for food. Natural origin for this listing is Indo-Pacific caves, reef overhangs and shaded coral ledges. In captivity, the aquarium should recreate the security of reef structure with caves, ledges, open turning space and excellent filtration. These fish produce more waste than small community species, so oxygenation, protein skimming and stable water quality are critical.\u003c\/p\u003e\u003ch2\u003eAppearance\u003c\/h2\u003e\u003cp\u003eMarine Betta should show clear eyes, full body condition, intact fins and a strong feeding response. The species has a dark body covered in pale spots, large fins and a false-eye marking near the tail that can confuse predators. Adult size is generally 18–20 cm, so the fish should never be purchased only for its current size. Colour, pattern and behaviour are usually best displayed once the fish has a secure territory and is feeding confidently.\u003c\/p\u003e\u003ch2\u003eTemperament and Compatibility\u003c\/h2\u003e\u003cp\u003eTemperament is best described as Peaceful predator; shy when new but confident once settled. Compatibility must be planned carefully. Suitable tank mates are generally robust marine fish that are too large to be swallowed and confident enough to feed, such as larger tangs, rabbitfish, large wrasse, robust angelfish, suitable triggers, groupers or other predators depending on the species. Avoid tiny fish, small ornamental shrimp, delicate timid species and anything that can fit into the mouth. For triggerfish and larger predators, also consider biting behaviour, rock movement and aggression at feeding time.\u003c\/p\u003e\u003ch2\u003eFeeding\u003c\/h2\u003e\u003cp\u003eFeed as a Carnivore; mysis, krill, chopped prawn, squid, clam and quality meaty marine foods. Use marine-based foods rather than freshwater feeder fish, as freshwater feeders are poor long-term nutrition and can contribute to health problems. Offer appropriately sized portions several times weekly or daily depending on the species, age and body condition. Predatory fish should be trained to accept frozen or prepared foods where possible. Feeding tongs are useful for eels, lionfish and scorpionfish, but hands should be kept away from mouths and venomous spines.\u003c\/p\u003e\u003ch2\u003eCare Requirements\u003c\/h2\u003e\u003cp\u003eMinimum aquarium size is 250 L, with 350 L or larger recommended for long-term care. Maintain temperature at 24–27°C, pH 8.1–8.4 and salinity 1.024–1.026. Provide strong biological filtration, quality protein skimming and regular water changes of 10–20% as required to control nitrate and phosphate. Flow should provide good oxygenation without preventing the fish from resting. Lighting can match the system and is usually not critical for the fish itself. Aquascaping must be stable, with secure rockwork that cannot collapse if a triggerfish, eel or large predator pushes through it. Eels require a tight lid with no gaps.\u003c\/p\u003e\u003ch2\u003eBreeding\u003c\/h2\u003e\u003cp\u003eCaptive spawning is uncommon but possible in specialist systems. Rearing larvae requires dedicated care and very small foods. In home aquariums, breeding should not be expected. Many of these species have complex courtship, pelagic eggs or larvae, large adult size or specialist rearing needs. The practical focus should be correct feeding, stable water quality, secure housing and careful tank mate selection.\u003c\/p\u003e\u003ch2\u003eSpecies Information\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eScientific Name\u003c\/td\u003e\n\u003ctd\u003eCalloplesiops altivelis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommon Name\u003c\/td\u003e\n\u003ctd\u003eMarine Betta\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eIndo-Pacific caves, reef overhangs and shaded coral ledges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Size\u003c\/td\u003e\n\u003ctd\u003e18–20 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLifespan\u003c\/td\u003e\n\u003ctd\u003e8–12 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperament\u003c\/td\u003e\n\u003ctd\u003ePeaceful predator; shy when new but confident once settled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDifficulty\u003c\/td\u003e\n\u003ctd\u003eIntermediate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Tank Size\u003c\/td\u003e\n\u003ctd\u003e250 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Tank Size\u003c\/td\u003e\n\u003ctd\u003e350 L or larger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiet\u003c\/td\u003e\n\u003ctd\u003eCarnivore; mysis, krill, chopped prawn, squid, clam and quality meaty marine foods\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Temperature\u003c\/td\u003e\n\u003ctd\u003e24–27°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003epH Range\u003c\/td\u003e\n\u003ctd\u003e8.1–8.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGH Range\u003c\/td\u003e\n\u003ctd\u003eNot applicable for marine aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSalinity\u003c\/td\u003e\n\u003ctd\u003e1.024–1.026\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuitable For\u003c\/td\u003e\n\u003ctd\u003eLarge marine aquariums, predator systems and specialist fish-only displays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReef Safe\u003c\/td\u003e\n\u003ctd\u003eCoral safe but may eat small shrimp or tiny fish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlant Safe\u003c\/td\u003e\n\u003ctd\u003eNot applicable for marine aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eSuitable Tank Mates\u003c\/h2\u003e\u003cp\u003eSuitable tank mates may include larger tangs, rabbitfish, robust wrasse, large angelfish with caution, larger clownfish, suitable triggers, groupers, larger hawkfish and other predator-safe marine fish. Match tank mates by adult size, temperament, feeding speed and risk of being swallowed or bitten.\u003c\/p\u003e\u003ch2\u003eAvoid Keeping With\u003c\/h2\u003e\u003cp\u003eAvoid small gobies, small cardinalfish, tiny wrasse, ornamental shrimp, crabs you want to keep safe, delicate timid fish, slow feeding fish, very aggressive tank mates in undersized aquariums, and any fish small enough to fit into the predator's mouth. Avoid open-top tanks for eels and avoid casual handling of lionfish or scorpionfish due to venomous spines.\u003c\/p\u003e","brand":"Nick's Aquarium Oceanarium Terrarium","offers":[{"title":"Small (1-5cm)","offer_id":55351897653539,"sku":null,"price":215.0,"currency_code":"AUD","in_stock":false},{"title":"Medium (5-10cm)","offer_id":55227178811683,"sku":"BA8595","price":249.0,"currency_code":"AUD","in_stock":false},{"title":"Large (10-15cm)","offer_id":55351897686307,"sku":null,"price":285.0,"currency_code":"AUD","in_stock":false},{"title":"X-Large (15-16cm)","offer_id":55351897719075,"sku":null,"price":330.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/Marine_Betta_Calloplesiops_altivelis_a69d6202-6a13-4234-8816-c5a1c3d19239.jpg?v=1781681226"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/collections\/Marine_Betta_Calloplesiops_altivelis_a69d6202-6a13-4234-8816-c5a1c3d19239.jpg?v=1783058952","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/collections\/grammas-basslets-assessors.oembed","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}