I have a 55g with a few fish I'm going to transfer to a smaller tank so the 55 will be empty. I want to fill it with either Oscars, Jack Dempsey's, Red Terrors, and Green Terrors. I would like to do a combo of some of them but don't know much about there aggression and who would fit in with who. I have spotted some nice Green Terrors at my LHS that I'm going to defiantly go with. what and how many would you go with in a long 55g?