I have a 15 inch oscar in a 135 gallon tank. Right now he is with a leporinus and a Raphael cat (that I never see). I was trying to think of some good tank mates for him. He has become very territorial towards other cichlids so they are out of the question (he beat up my Paratilapia and Electric blue jack dempsy, who are now friends for some reason). I don't want to write what I was thinking for his tank mates so as to bias anybody, but I am looking for some interesting fish that swim around the tank.