

🐟 Keep your Betta thriving — because your fish deserves the best care!
API BETTAFIX is a 1.7-ounce antibacterial and antifungal treatment designed specifically for Betta fish. It contains natural melaleuca (tea tree) extract to heal bacterial infections, fin rot, ulcers, and wounds while promoting rapid tissue regrowth. Ideal for treating sick fish or preventing disease in new tank additions, it’s trusted by thousands with a 4.3-star rating and proven fast-acting results.




| Customer Reviews | 4.3 out of 5 stars 7,508 Reviews |
J**E
Works great
Worked great. Saw an immediate change in my fish. He is up swimming and doing well. His color is much better. Whatever was bothering him is gone. I did a price comparison at a local pet store and this one was half the price.
B**S
Lifesaver!
The Beta Fix water additive was a real life saver for us. We had to make an emergency move with one of our fish into another tank, and this product made the transition so much smoother. It worked quickly, and the fish handled the move without any issues. It’s easy to use, effective, and gave us peace of mind in a stressful situation. Definitely something worth keeping on hand for any fish owner—you never know when you’ll need it.
L**5
Works great against fin rot
My betta fish didn't look great when I got him, but he was a color match for one I'd bought with my nieces and nephew that didn't make it through his first water change. I was careful, but the other guy just didn't handle the stress of the new tank. I've had many betta fish over the years. They normally last about 6/7 years. I hadn't had one in a while and I felt it would be a fun thing to get for the kids. So, when the little guy didn't make it I rushed out to the pet store looking for a near match so the kids weren't upset. The only similar fish the pet store had looked a little tired with fins that weren't great, but not that bad. I took a chance and thought he might do better with a good water change, nice size tank, and some TLC. I used a little aquarium salt at first as I'd read it fixes most issues like these, but it wasn't enough. His energy was good, but his fins got worse, and clean water changes weren't working. I think they were stressing him out. It didn't look like normal fin rot. The tail had gotten really pointy and strange looking. I've never had that happen with a fish before. In fact, I've never had to deal with fin rot at all. After some research I bought this to give it a shot and within a week the little guy has a nice, normal, fan-like tail instead of the pointy rotten one. He's doing great. I've never used a product like this, so I have nothing to compare it to. I didn't know what to expect, but I'm thrilled with the results. The little guy is flaring again and swimming all over the tank. I'll keep this product on hand as long as I own fish to ensure I have it if they need it. I think when using this product, like with any chemicals for your fish, that you follow directions and err on the side of caution so as not to use too much. My little guy is recovering and I've stopped using the product. There's a very small hole in the tail, but I think at this point the aquarium salt and frequent clean water will heal that.
B**Y
Great
Worked for my betta he looks a lot better now.
S**E
one of the best products
My beta was dying. Let's just get that out right now. He had fin rot. He was malnourished. His tank was the complete wrong ph and it seemed that everything i did was making it worse. So as a last-ditch effort, i got this. Poured some in his water filter every day. Withing in TWO DAYS, he was swimming, he was eating, the milky spots on his fins and scales was clearing up. His tanks algae finally started going away. I would absolutely recommend. And i have already purchased this a second time to keep on hand, just in case. It is small but it does have enough to do a whole week for a 10 gl tank.
S**J
Good product, but worse cup design
Good product for your Berta fish, but I had received a item that different from the picture. This cup design makes it hard to add the right amount of the medication for my betta.
W**R
Miracle Curr
My poor betta “Hagrid” developed some sort of lesion, sore, ulcer, not sure what it even was a few months ago. He was still eating and acting normal and I read it should heal itself. It kept getting worse and worse and I wasn’t sure what to do. On a Saturday, I couldn’t find him in his tank anywhere. I put a few food pellets in as that usually gets him to come out of his hiding spot. Still nothing. I starting taking out the cave ornaments and tree trunk ornaments and there was Haggy, colorless and lifeless looking. I cleaned the tank out completely and did a complete water change and put him back in. The next morning, Hagrid was even worse, I thought he was dead. I took him out of the tank and put him in a smaller pint size container, this time I noticed he was bleeding from the white lesion spot at the top of his body where the dorsal fin is. I thought for sure he wouldn’t make it thru the night and I stared to look on how to humanely euthanize a betta fish. On a whim, I came across this product and figured what the heck I have nothing to lose. I ordered it on Sunday night and it arrived Monday morning. I followed the directions to a T and added 9 drops to a pint of water and hoped for the best. Hagrid still did not want to eat and was just laying at the bottom of the cup of water. I left him alone in a darkened room and checked on him Tuesday morning after just one treatment and he was starting to swim around! I did another complete water change of the pint container and added 9 drops to the new water. By Tuesday afternoon he was swimming around and looking better. I figured maybe he is hungry as he hadn’t eaten in 3-4 days and sure enough he ate 2-3 pellets! I have no idea how this product works or what is actually wrong with Hagrid, but the white lesion looking thing seems to be shrinking/healing. Today is day 2 and I will continue treatment for the full 7 days as recommended. Definitely give this a shot! I would recommend a quarantine/hospital tank as filter media could make the product less effective, and this way you can make sure the dosage is completely accurate and use it sparingly.
M**Y
Danger, Will Robinson!!!
1) this "heals" (I think) by irritating your fish until it produces a better slime coat 2) it IS an antibacterial/antimicrobial/antifungal for the water so if your water is scummy or full of algae, it will clear it up in 2 days. It will also kill your plants because it messes up the water balance. 3) if your Betta is on death's doorstep, do NOT use this. If you try it, do about 10% for 2 days to see how he tolerates it. The weaker the fish, the more likely this will kill him instead of helping 4) make D**NED sure you're water balance is PERFECT before adding 5) be aware that this will send your KH and TAL through the roof and mess with your pH, even in a perfect tank. MONITOR CLOSELY. I can't say never to use this. It really did clear up the bacterial biofilm on the surface of my tank for a while BUT I only used full dose on the 3rd day. Water parameters went psycho, after that. Betta quit eating... I hope he survives. I recommend finding a good Betta forum online before getting to desperate place. I believe that most Betta illnesses are a result of malnutrition, now. Ignore the employee at the Big Box store who says to give them one lekker every other day and feed them according to the directions on their food. Big Box starves them so the water in those cups doesn't get too dirty. I've lost 3 bettas that I think the cause was starvation or malnutrition from following Big Box advice (and waiting until they were nearly don't to try bettafix, as stated, they were too weak for it to do anything but stress them the rest of the way). I kept treating the symptoms in desperation, not knowing the cause. But seriously. Monitor CLOSELY if you try it. Start low dose. It has some benefits but don't use it to try to "save" a sick fish.
Trustpilot
4 days ago
2 weeks ago