My betta fish has a growing lump on its side. How can I treat it?

Question

hi! my betta fish has had a lump on his side for about 10 days, and it seems to be growing. i’ve tried salt baths but nothing has seemed to work. i also don’t live near any fish vets or, vets in general. i’ll send some pictures, and you can see the growth in them. the bump has become more stretched out and lighter. Pet's info: Fish | Betta | Male | 2 years and 3 months old | 0.06 lbs

Angel Alvarado, LVT · Accepted Answer

It may be a tumor or infection since it is just on one side. Without diagnostics though, it can be difficult to determine the underlying cause. Maintain pristine water quality via filtration and regular partial water changes. You can try a broad spectrum antibiotic which can be found in the aquarium section of the local Petco. Follow label directions carefully and remove the carbon filter insert during treatment if indicated. If antibiotics to not resolve the lump, then it could be a tumor or mass which would need to be addressed by a veterinarian experienced in treating aquatics.

My betta fish has a growing lump on its side. How can I treat it?

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