Veto;2471287; said:They are hardly 4" long , how can this tank be too small? I've seen full grown O's live in a 75g that get along fine (granted thats too small but I have seen it).
Territorial wise it's not enough room. And sure, 2 Oscars 'can' get along in a 75 g if they're a compatiable pair. Although anyone who cared about their fish wouldn't put two foot-long fish in a 75 gal. You quite obviously don't have a compatiable pair though. A is telling B to move out and B has nowhere to move to. It's my opinion that a 55 g is too small for even a single Oscar and no way is it big enough for 2 that don't get along. Your options are either seperate them or place one. Or place both and wait until you can get a 75 g to get another one (not 2).