I have had an Albino Oscar for about 6 months. He was in my S. American Tank and not doing very well. He was getting picked on by other fish even smaller than he was. So I swooped him out and put him in with my African Cichlids hoping the considerable size difference would help. (I had done this with a Peacock Cichlid in reverse and it worked like a charm.) He is no longer being picked on, but he will not come out from behind a rock and it has been months. He barely eats, he hasn't grown, and he looks very thin and unhealthy. He has no outside signs of illness, no growths or parasites. I don't know what to do. If something doesn't change I am afraid he will die. All the other fish in the tank are healthy, and the water conditions are ammonia 0, nitrite and nitrate about 2.5 ppm. I use salt, slime, and water conditioner. I don't know why he is not doing well when all the other fish are.