Hi. I am hoping someone who knows a lot about cichlids can help me. I have had my Oscar from fairly small for like 3 or 4 years. He always used to respond to being fed and people moving around, and almost bite ya finger off, very characteristic. For a while now though he is looking really sorry for himself. He is pale, thin, often hides or lays near the bottom, hardly eats if at all. I haven't changed anything in the tank or procedures I go through and I can see no visible reason for his sickening. He has been like this for a good few months now and I keep thinking one day he will die of whatever this is! Can anyone suggest what's wrong with him? 
