{"product_id":"api-betta-fix","title":"API Betta Fix","description":"\u003cp\u003e\u003cstrong\u003eA pre-diluted tea-tree remedy, measured for tanks under five litres.\u003c\/strong\u003e API Betta Fix is a 50 mL antibacterial remedy containing 0.2% melaleuca oil, listed on the label as cajuput oil. API indicates it for bettas showing signs of bacterial disease such as frayed or torn fins, red ulcers or slimy patches. It is dosed at half a teaspoon per US gallon, daily for up to seven days, followed by a water change.\u003c\/p\u003e\n\n\u003ch3\u003eKey features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDosed in units that suit a betta tank\u003c\/strong\u003e — the label gives a rate for a 1 litre container, not just for a 38 litre aquarium, so you are not trying to measure a fifth of a millilitre.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.2% melaleuca oil\u003c\/strong\u003e — one fifth the concentrate strength of API Melafix, pre-diluted so a small overdose in a small volume is less likely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStated safe with snails and shrimp\u003c\/strong\u003e — API states BettaFix is safe with invertebrates such as snails and shrimps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoes not harm the biological filter\u003c\/strong\u003e — API states it will not harm the biological filter or aquarium plants, so a filtered betta tank can be treated in place.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeven-day course, then stop\u003c\/strong\u003e — the label sets a defined end point and a water change, rather than open-ended dosing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDosage and directions\u003c\/h3\u003e\n\u003cp\u003eTranscribed from API's registered label. Repeat the dose daily for up to seven days, then make a water change.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eWater volume\u003c\/th\u003e\n\u003cth\u003eDose per day\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e946 mL (1 US quart)\u003c\/td\u003e\n\u003ctd\u003e1\/8 teaspoon (0.6 mL)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1.9 L (half a US gallon)\u003c\/td\u003e\n\u003ctd\u003e1\/4 teaspoon (1.25 mL)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3.8 L (1 US gallon)\u003c\/td\u003e\n\u003ctd\u003e1\/2 teaspoon (2.5 mL)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThat works out to roughly 0.66 mL per litre of water, whichever measure you start from.\u003c\/p\u003e\n\n\u003ch3\u003eHow far does a 50 mL bottle go?\u003c\/h3\u003e\n\u003cp\u003eA single dose is not the useful number here, because BettaFix is dosed daily for a week. Worked out as complete seven-day courses:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eContainer volume\u003c\/th\u003e\n\u003cth\u003eDose per day\u003c\/th\u003e\n\u003cth\u003eA full 7-day course uses\u003c\/th\u003e\n\u003cth\u003eCourses in a 50 mL bottle\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1 L\u003c\/td\u003e\n\u003ctd\u003e0.6 mL\u003c\/td\u003e\n\u003ctd\u003eAbout 4 mL\u003c\/td\u003e\n\u003ctd\u003eAbout 11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2 L\u003c\/td\u003e\n\u003ctd\u003e1.3 mL\u003c\/td\u003e\n\u003ctd\u003eAbout 9 mL\u003c\/td\u003e\n\u003ctd\u003eAbout 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4 L\u003c\/td\u003e\n\u003ctd\u003e2.6 mL\u003c\/td\u003e\n\u003ctd\u003eAbout 18 mL\u003c\/td\u003e\n\u003ctd\u003eAbout 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e10 L\u003c\/td\u003e\n\u003ctd\u003e6.6 mL\u003c\/td\u003e\n\u003ctd\u003eAbout 46 mL\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e20 L\u003c\/td\u003e\n\u003ctd\u003e13.2 mL\u003c\/td\u003e\n\u003ctd\u003eAbout 92 mL\u003c\/td\u003e\n\u003ctd\u003eJust over half a course\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThe practical limit is around 10 litres. Above that, a 50 mL bottle of BettaFix cannot finish a single course, and the concentrate is the sensible buy instead.\u003c\/p\u003e\n\n\u003ch3\u003eBettaFix or Melafix?\u003c\/h3\u003e\n\u003cp\u003eThese are the same active ingredient at different strengths, and the difference is genuinely one of packaging rather than potency. Both labels work out to about the same amount of melaleuca oil in the water once dosed.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003cth\u003eAPI BettaFix\u003c\/th\u003e\n\u003cth\u003eAPI Melafix\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActive constituent\u003c\/td\u003e\n\u003ctd\u003eCajuput (melaleuca) oil 0.2%\u003c\/td\u003e\n\u003ctd\u003eCajuput (melaleuca) oil 1.0%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLabel dose\u003c\/td\u003e\n\u003ctd\u003e2.5 mL per 3.8 L\u003c\/td\u003e\n\u003ctd\u003e5 mL per 38 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMelaleuca oil in the water\u003c\/td\u003e\n\u003ctd\u003eAbout 1.3 mg per litre\u003c\/td\u003e\n\u003ctd\u003eAbout 1.3 mg per litre\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCourse\u003c\/td\u003e\n\u003ctd\u003eDaily for up to 7 days, then a water change\u003c\/td\u003e\n\u003ctd\u003eDaily for 7 days, then a 25% water change\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest suited to\u003c\/td\u003e\n\u003ctd\u003eBowls and tanks up to about 10 L\u003c\/td\u003e\n\u003ctd\u003eAquariums from about 20 L up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eSo BettaFix is not a weaker treatment. It is the same treatment pre-diluted, so that a measurable dose exists for a volume of water where a drop either way of the concentrate would matter. If your betta lives in a 60 litre planted tank, \u003ca href=\"\/products\/api-melafix\"\u003eAPI Melafix\u003c\/a\u003e is the cheaper and more practical choice.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBottle size\u003c\/th\u003e\n\u003ctd\u003e50 mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eActive constituent\u003c\/th\u003e\n\u003ctd\u003eCajuput oil (melaleuca oil), 0.2 g per 100 mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDose rate\u003c\/th\u003e\n\u003ctd\u003e2.5 mL per 3.8 L, or about 0.66 mL per litre\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCourse length\u003c\/th\u003e\n\u003ctd\u003eDaily for up to 7 days, then a water change\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIndicated for\u003c\/th\u003e\n\u003ctd\u003eBettas showing signs of bacterial disease: frayed or torn fins, red ulcers, slimy patches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWater type\u003c\/th\u003e\n\u003ctd\u003eFreshwater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInvertebrates\u003c\/th\u003e\n\u003ctd\u003eAPI states it is safe with invertebrates such as snails and shrimps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBiological filter and plants\u003c\/th\u003e\n\u003ctd\u003eAPI states it will not harm the biological filter or aquarium plants\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStorage\u003c\/th\u003e\n\u003ctd\u003eStore below 38 degrees C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFreight\u003c\/th\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eActive constituent\u003c\/h3\u003e\n\u003cp\u003eTranscribed from API's registered label, checked 7 August 2026.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eConstituent\u003c\/th\u003e\n\u003cth\u003eConcentration\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCajuput oil (melaleuca oil)\u003c\/td\u003e\n\u003ctd\u003e0.2 g in 100 mL (0.2%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eAPI does not declare the inactive ingredients for BettaFix on the label, so we cannot list them.\u003c\/p\u003e\n\n\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSuitable for:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBetta bowls, jars and tanks up to about 10 litres\u003c\/li\u003e\n\u003cli\u003eTanks housing snails or shrimp, which API states are unaffected\u003c\/li\u003e\n\u003cli\u003ePlanted betta tanks, which API states are unaffected\u003c\/li\u003e\n\u003cli\u003eTreating in the display tank, since the biological filter is not harmed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAquariums above about 10 litres, where one 50 mL bottle cannot complete a course\u003c\/li\u003e\n\u003cli\u003eOpen-ended dosing. The label stops at seven days and a water change\u003c\/li\u003e\n\u003cli\u003eReplacing a diagnosis. Torn fins caused by a sharp ornament, a tank mate or poor water quality will keep recurring until the cause is fixed\u003c\/li\u003e\n\u003cli\u003eAny fish intended for human consumption\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat to do between and after courses\u003c\/h3\u003e\n\u003cp\u003eComplete the seven days, then make a water change as the label directs. If the signs have not improved, stop and reassess rather than starting straight into another course. Check ammonia, nitrite and temperature first, because damaged fins very often trace back to water quality or a chill rather than to an infection that a remedy alone will resolve.\u003c\/p\u003e\n\u003cp\u003eAPI's label carries no instruction to remove activated carbon. If you run carbon and want to be sure the dose stays in the water, take it out for the seven days and refit fresh carbon at the final water change.\u003c\/p\u003e\n\n\u003ch3\u003eSafety\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHarmful if swallowed. Causes serious eye irritation. Causes skin irritation.\u003c\/li\u003e\n\u003cli\u003eFor animal treatment only. Not for human consumption, and not for treating fish intended for human consumption.\u003c\/li\u003e\n\u003cli\u003eKeep out of reach of children.\u003c\/li\u003e\n\u003cli\u003eStore below 38 degrees C, which in a Queensland summer means indoors rather than in a garage or shed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eGoes well with\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/api-melafix\"\u003eAPI Melafix\u003c\/a\u003e — the same active at 1.0%, for aquariums above about 20 litres.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/api-pimafix\"\u003eAPI Pimafix\u003c\/a\u003e — API's companion remedy, indicated for fungal signs rather than bacterial.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/api-freshwater-master-multi-test-kit-5-in-1\"\u003eAPI Freshwater Master Multi Test Kit 5 in 1\u003c\/a\u003e — rules out the ammonia or nitrite problem that causes most fin damage in small tanks.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/api-betta-water-conditioner-50ml\"\u003eAPI Betta Water Conditioner 50ml\u003c\/a\u003e — dechlorinates the replacement water for the post-course change.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/api-aquarium-salt\"\u003eAPI Aquarium Salt\u003c\/a\u003e — freshwater tonic salt, often used alongside a course in a quarantine tank.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/marina-floating-glass-thermometer\"\u003eMarina Floating Glass Thermometer\u003c\/a\u003e — bettas held below about 24 degrees C get sick, and an unheated bowl is a common cause.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\n\u003cp\u003eThis is a consumable remedy, so no manufacturer warranty period applies. Your rights under the Australian Consumer Law are unaffected: if the product is faulty, unsafe or not as described, you are entitled to a remedy. Ships as standard freight.\u003c\/p\u003e\n\n\u003ch3\u003eCommon questions\u003c\/h3\u003e\n\u003ch4\u003eHow much API BettaFix do I use in a 4 litre betta tank?\u003c\/h4\u003e\n\u003cp\u003eAbout 2.6 mL a day, following API's rate of half a teaspoon (2.5 mL) per US gallon (3.8 L). Repeat daily for up to seven days, then make a water change. A 50 mL bottle covers roughly two full courses at that volume.\u003c\/p\u003e\n\u003ch4\u003eIs BettaFix just watered-down Melafix?\u003c\/h4\u003e\n\u003cp\u003eEffectively yes, and that is the point. BettaFix is 0.2% melaleuca oil dosed at 2.5 mL per 3.8 L; Melafix is 1.0% dosed at 5 mL per 38 L. Both land at roughly 1.3 mg of melaleuca oil per litre of tank water. BettaFix exists so a measurable dose is available for a container too small to dose the concentrate accurately.\u003c\/p\u003e\n\u003ch4\u003eIs API BettaFix safe with shrimp and snails?\u003c\/h4\u003e\n\u003cp\u003eAPI states that BettaFix is safe with invertebrates such as snails and shrimps, and that it will not harm the biological filter or aquarium plants. That makes it usable in a planted betta tank without moving the fish out.\u003c\/p\u003e\n\u003ch4\u003eDo I need to remove activated carbon while dosing?\u003c\/h4\u003e\n\u003cp\u003eAPI's BettaFix label gives no instruction to remove carbon. If you run carbon and want certainty that the dose stays in the water, remove it for the seven days and fit fresh carbon at the water change that ends the course.\u003c\/p\u003e\n\u003ch4\u003eWhat if my betta's fins have not improved after seven days?\u003c\/h4\u003e\n\u003cp\u003eStop at seven days and make the water change the label directs, then look for a cause rather than re-dosing indefinitely. Test ammonia and nitrite, check the temperature, and check the tank for sharp ornaments or an aggressive tank mate. Persistent or worsening signs are worth a consult rather than a second bottle.\u003c\/p\u003e\n\u003ch4\u003eCan I use BettaFix in a saltwater tank?\u003c\/h4\u003e\n\u003cp\u003eNo. BettaFix is a freshwater product for bettas. API sells a separate Marine Melafix formulation for saltwater aquariums.\u003c\/p\u003e","brand":"API","offers":[{"title":"Default Title","offer_id":55242269360419,"sku":"AA0539","price":16.15,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/api-betta-fix-4568-1600.jpg?v=1781836678","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/api-betta-fix","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}