I am a lil bit confused right know how often I feed my fish. because I have my oscar (nearly 7") When he's like 2-3" I feed him twice a day and in the afternoon/evening his belly will be flat now I still continue to feed him twice a day but I think he's having a hard time digesting the food because of age? No negative signs though. Just his belly is taking a little more time before it gets a little flat (i'm sure i'm not overfeeding) Does it really depend on the size or age of the fish?