Hi. My catfish is about 3 inches and is always staying at the top.It looks like it has gill curl and it seems to have lost it's appetite other than eating one or two frozen blood worms every few days. I have a air stone in the tank and I had recently did a 50+% water change. What should I do? Thanks.
Gill curl is caused by poor water quality and unfortunately it's not always reversible. Luckily for you it's much more likely to be reversed in younger fish like yours. Your cat may be at the top to gulp air, due to its damaged gills.What are your water parameters and how often are you doing water changes? Make sure ammo and Nitrites are 0 and keep nitrates as low as possible. You should start doing daily water changes of at least 25%. If you read back in this thread, around page 30, you'll see a discussion of gill curl, including some stuff from necrocanis, who knows his stuff. He's gotten rid of gill curl on young cats by doing daily water changes until it subsides.
Again, it may not be reversible and your cat may have a tougher time getting the amount of oxygen it needs, so make sure its tank is well oxygenated. good luck