

🌿 Heal your fish, protect your pride — aquarium care that means business!
API MELAFIX is a 4-ounce freshwater fish bacterial infection remedy that uses natural tea tree extract to heal fin rot, ulcers, and open wounds within 7 days. Safe for aquarium biofilters and pH levels, it also prevents disease in new fish with a 3-day quarantine dose. Trusted by thousands, it’s a must-have for maintaining a vibrant, healthy freshwater tank.









| ASIN | B0002567SM |
| ASIN | B0002567SM |
| Best Sellers Rank | #7,630 in Pet Supplies ( See Top 100 in Pet Supplies ) #5 in Fish Medication & Health Supplies |
| Brand Name | API |
| Color | Black |
| Country of Origin | United States |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,768) |
| Date First Available | June 20, 2004 |
| Date First Available | June 20, 2004 |
| Department | Unisex-Adult |
| Department | Unisex-Adult |
| Directions | Use when adding new fish to an aquarium, and to treat symptoms like open red sores, fin & tail rot, eye cloud, pop eye, body slime & mouth fungus, open body wounds. Shake well, and remove activated carbon, if possible. Add 1 teaspoon (5 ml.) per 10 U.S. gallons (38 L) of water. For diseased or wounded fish, dose daily for 7 days. After 7 days, perform a 25% water change, continuing treatment if ne… |
| Is Discontinued By Manufacturer | Yes |
| Item Dimensions LxWxH | 5 x 2 x 12 inches |
| Item Package Dimensions L x W x H | 6.06 x 1.46 x 1.42 inches |
| Item Weight | 136.08 Grams |
| Item model number | 11G |
| Item model number | 11G |
| Manufacturer | Mars Fishcare |
| Manufacturer | Mars Fishcare |
| Material | Plastic |
| Model Name | MELAFIX, 4 OZ |
| Number of Items | 1 |
| Product Dimensions | 5 x 2 x 12 inches; 4.8 ounces |
| Size | 4-Ounce |
| Style | Freshwater |
| Target Audience Keyword | fish, fish;algae-eaters; betta-fish; bottom-feeder-fish; cichlid-fish; goldfish; invertebrate-fish; mollusks; octopuses; rays; sharks; snails |
A**E
Works
It worked. It took seven days and some prayers but the popeye is gone from my betta. It was enormous.
B**A
Fish saver!
My goldfish Lox started to get fin rot very badly, and his demeanor changed. Within 4 days of treatment his fins started to look healthy and beautiful again. This product is excellent and affordable! There is a bit of a medicine smell to it but nothing overwhelming or bothersome! Photo shared is after 4 days, prior his back fin was almost all black!
B**Y
This is a great product
I love this stuff! It healed my fish back to her happy normal self! She had severe fin rot and a clouded eye. You just have to pay attention the the dosing instructions and adjust dosing measurements accordingly, based on the size of your hospital tank. I will say (as I didn't know this initially) it is best to fast your fish during the treatment process. This information is not included in the directions - I had to research and figure this out on my own. This way the medication can do its job effectively. Depending on the severity of your fish's illness - more than one treatment may be required. With time, patience, research specific to your fish, etc you will get your fish back to a healthy state in no time.
J**.
It’s working!
So far this is the only thing I’ve seen that is showing improvement in my goldfish’s fin rot. I’ve quarantined him alone in a tank, and followed directions exactly. After 5 days/and doses he’s showing signs of new healthy fin growth. Plus it does not change water color and smells like tea tree oil.
A**S
Saved my fish!
I got a poor little Betta fish from a chain pet store (probably my first mistake) and I was so excited because he was tri-colored and had a beautiful teal look to him! And he was what I was looking for 'red/white/blue' I was so excited! Well he got put into his new tank, and he didn't seem to be moving around much, even for a betta which I have owned in the past. I started taking a closer look at him about a month after I got him, and he looked to have fin rot. He had been biting his tail in the tiny cup which is hard to see in the photos... So I got this neat stuff because it's less than half of betta fix, is the same active ingredient, and has a higher concentration. Win, win, win. Started using it in his tank on a regular, adding one drop per gallon with an eye dropper and doing regular water changes. And would you know it, he started changing colors! Now I'm not saying that this stuff will make your fish morph like it did mine, but it will save them if you use it as instructed for what it is meant to be used for. What I didn't know at the time of buying him is that he had a SEVERE bacterial infection all over his face and sides. That white I thought was part of his color WAS HIM BEING EATEN ALIVE BY THIS BACTERIA. This medication is designed to get rid of that bacteria, which is what causes fin rot as well. After using it for about 3 months on a regular I had a completely different fish, literally. He was so much happier and looked even more vibrant and had much more energy to inspect and even flair at my camera and show of his beautiful colors. Long story short, if you use this, USE IT FOR WHAT ITS MEANT TO BE USED FOR AND YOU'LL GET GREAT RESULTS. I know I did. I still have little ATO to this day (I've had him for about two years now) and he now has an entourage of shrimp palls to keep him company. In the picture provided you can still see some of the bacteria on his face around his eyes, that's long gone at this point but I couldn't get a good picture for him from today. Little bugger keeps teasing me and then swimming away, ah well. These ones will be good enough.
G**G
yippie!
worked in days on my goldfish!
K**T
Works well!
This works well. I had an injured fish and I did one dose and he was healed. :)
Z**Y
Can and will kill fish sometimes
Not sure how long bettas live but I had a two year old fish that died after being medicated. However I would say that you use this as a preventative medication.
E**.
Been using this for my aquarium 👍🏼
S**K
Very good product, with in 2 days of usage my flowerhorn fish head wound got recovered.
P**L
Yes, we like this product. It help our fish to get better. Thanks
G**O
Buen producto, no se salvo mi pez, ya estaba grande
A**R
Très efficace. Merci!!!
Trustpilot
2 months ago
2 weeks ago