can you put two oscars (one black, one albino) in a 55 if nothing else is in there with them? purchase size would be about 4 or 5" but i know they grow very quickly. if not, could i get one and keep giant danios, tiger barbs or a pair of firemouth cichlids with it? my TB's are all close to 3", and my giant danios are all around 4". the firemouths are around 4" as well. i know with oscars it's a guessing game because they all behave differently. i wonder if the oscar could even catch the barbs or danios, and since they are all full grown he would have to be pretty big to swallow them.