I have a 1.5" oscar currently residing in my 10-gallon tank, with an equal sized Plecostomus in the tank to keep the algae down. So far (about 2 weeks) they don't mind each other. Will this stay this way as they get older, or will they start to hate each other? They both come from Eastern South America, so may they actually be compatable in the wild? Does anyone know for sure what other fish the Oscar wouldn't eat if given the chance, so they may be able to coexist in the same tank?