{"product_id":"butterfly-tail-goldfish-carassius-auratus","title":"Butterfly Tail Goldfish | Carassius auratus","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\n\u003cp\u003eViewed from above, the Butterfly Tail Goldfish spreads a perfect pair of butterfly-wing fins — a gentle twin-tail fancy best appreciated in a shallow tank or from the top. Like all fancy goldfish it is a coldwater fish that stays comparatively small but is a heavy waste producer, so it needs generous filtration and space. Adults reach around 15–18cm.\u003c\/p\u003e\n\u003ch2\u003eNatural Habitat\u003c\/h2\u003e\n\u003cp\u003eFancy goldfish are entirely domesticated forms of Carassius auratus, a hardy cyprinid originally from East Asia. They exist only in captivity; wild goldfish are plain, streamlined pond fish. Ornamental strains like the Butterfly Tail are bred for body shape and fin form and are best kept in cool, well-filtered aquaria or ponds.\u003c\/p\u003e\n\u003ch2\u003eAppearance\u003c\/h2\u003e\n\u003cp\u003eAn egg-shaped, twin-tailed fancy whose defining feature is the caudal fin, which splays out flat like a butterfly's wings when seen from above. Colours range from metallic orange and red through calico, black and white. The flowing fins are delicate, so tank décor should be smooth.\u003c\/p\u003e\n\u003ch2\u003eTemperament and Compatibility\u003c\/h2\u003e\n\u003cp\u003ePeaceful and slow-moving. Best kept with other fancy goldfish of similar swimming ability, as fast single-tail goldfish will out-compete them for food. Not suited to tropical community fish or anything that nips fins.\u003c\/p\u003e\n\u003ch2\u003eFeeding\u003c\/h2\u003e\n\u003cp\u003eAn omnivore. Feed a sinking goldfish pellet or gel food as the staple — sinking foods reduce the air-gulping that causes buoyancy problems in round-bodied fancies — plus blanched vegetables and occasional frozen treats. Do not overfeed.\u003c\/p\u003e\n\u003ch2\u003eCare Requirements\u003c\/h2\u003e\n\u003cp\u003eProvide a large, cool (18–24°C), heavily filtered tank with plenty of surface area; goldfish are messy and need frequent water changes to keep ammonia and nitrate in check. Avoid sharp décor that can tear the fins. They do not need a heater and prefer cooler temperatures.\u003c\/p\u003e\n\u003ch2\u003eBreeding\u003c\/h2\u003e\n\u003cp\u003eEgg-scatterers that spawn in spring as water warms, scattering adhesive eggs over plants and surfaces. They give no parental care and will eat their own eggs, so a dedicated setup is needed to raise fry, which are culled and selected over time for fin quality.\u003c\/p\u003e\n\u003ch2\u003eSpecies Information\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eScientific Name\u003c\/td\u003e\n\u003ctd\u003eCarassius auratus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommon Name\u003c\/td\u003e\n\u003ctd\u003eButterfly Tail Goldfish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eEast Asia (domesticated fancy strain)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Size\u003c\/td\u003e\n\u003ctd\u003eAround 15–18cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLifespan\u003c\/td\u003e\n\u003ctd\u003e10–15 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperament\u003c\/td\u003e\n\u003ctd\u003ePeaceful (slow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDifficulty\u003c\/td\u003e\n\u003ctd\u003eBeginner\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Tank Size\u003c\/td\u003e\n\u003ctd\u003e75 litres for one, plus ~40 litres per extra fish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Tank Size\u003c\/td\u003e\n\u003ctd\u003e110 litres or more\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiet\u003c\/td\u003e\n\u003ctd\u003eOmnivore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Temperature\u003c\/td\u003e\n\u003ctd\u003e18–24°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003epH Range\u003c\/td\u003e\n\u003ctd\u003e7.0–8.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGH Range\u003c\/td\u003e\n\u003ctd\u003e8–20 dGH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSalinity\u003c\/td\u003e\n\u003ctd\u003eNot applicable (freshwater)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuitable For\u003c\/td\u003e\n\u003ctd\u003eColdwater fancy goldfish tanks, top-view displays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReef Safe\u003c\/td\u003e\n\u003ctd\u003eNot applicable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlant Safe\u003c\/td\u003e\n\u003ctd\u003eNo (nibbles and uproots soft plants)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eSuitable Tank Mates\u003c\/h2\u003e\n\u003cp\u003eOther fancy goldfish of similar body type and swimming speed, such as Fantails, Ryukins, Orandas and Ranchu.\u003c\/p\u003e\n\u003ch2\u003eAvoid Keeping With\u003c\/h2\u003e\n\u003cp\u003eFast single-tail goldfish (common, comet, shubunkin), tropical community fish, fin-nippers, and any warm-water species.\u003c\/p\u003e","brand":"Nick's Aquarium Oceanarium Terrarium","offers":[{"title":"Small (1-5cm)","offer_id":55232820740387,"sku":null,"price":13.95,"currency_code":"AUD","in_stock":false},{"title":"Medium (5-10cm)","offer_id":55232820773155,"sku":"AA1806","price":18.95,"currency_code":"AUD","in_stock":false},{"title":"Large (10-15cm)","offer_id":55232820805923,"sku":null,"price":23.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/Butterfly_Tail_Goldfish_fa25c153-f6c6-4299-8ad0-6d8529ac6000.jpg?v=1781697547","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/butterfly-tail-goldfish-carassius-auratus","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}