Hi, I am new to this site and need some help. I have a 7 1/2 year old albino afc that isn't quite acting normal in my opinion. He eats well (reptomin) every day and sings at night. He is in a 10 gal tank with nothing on the bottom. It is filtered with a Whisper internal power filter for a 10 gal tank. I do a water change every week (25%). He is normal size but he has a bulge on one side of his body (left). He swims fine but when he goes to rest on the bottom, he kind of floats on one side(the right). He has been doing this for a few months. He also has what I can only describe as a type of seizure every few weeks. The water peramiters are fine. Well water, all test results are good (ph is 7.4 , no ammonia, no nitrites and nitrates less than 20). The tank has been going for 4 years. He is not bloated so I can't think of what it coud be ( possibly a tumor?) Any suggestions would be greatly appreciated. Thanks.