I have two red tiger motags (7" male and 4" female). The male is extremely peaceful with other fish...except when with her. He attacking my TSN relentlessly. He also killed a large jaguar. I would like to keep the two together, as their colors are much more vibrant in pairs. Is there anything I can do with the tank (135 gal) to keep him calm? Do I need to remove him? What size tank do I need in order to keep the pair together?

