There's something wrong with my fish, and I know fish aren't that important but it can't hurt to ask right? He's got a little puffy white thing coming off his side, its started to turn pinkish in the center and its definitely affecting his buoyancy, I don't know what it is or how to fix it
All pets are important to us! It is possible it may be an abscess or infection. If it is a tumor and is growing fast, there may not be much you can do other than keep him comfortable. For now, move him into his own tank or bowl if he has tankmates just in case whatever he has is infectious and to make treatment easier. A wide variety of infections and afflictions in fish can be treated using simple aquarium salt (NOT table salt). Dissolve one teaspoon per gallon of water and allow him to swim in it. Change the water daily. Mix a fresh salt solution each day. Do this for 7-10 days. You can fast him for a day or two then offer bits of shelled green peas. This can help with constipation and swim bladder issues. Hopefully, this will result in some improvement or resolution. If not, you may need to treat for specific infections (bacterial, fungal or parasites). This would require an exam with a veterinarian that is experienced in treating fish. It can be done, but unfortunately the prognosis for an ill fish may be poor.
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