From what i have been told, there are some that are really not recomended to be with eachother (ie- koran and emperor, majestic and blue face, queen and blue) the ones that look similar when they are juvies. Im not sure if that is completly correct. I tried to put a majestic in with my koran and that didnt work so well, at all. It all just depends on the fish (my koran is very agressive and teritorial). I think it should be fine in a 200 though. Good luck. bump