I have 3 Percs in my 220, all different sizes. Recently, I added a gs Maroon clown to host my two very large BTAs. The maroon was smaller than all the Percs but has grown fast. In the beginning , despite his smaller size, the maroon would have a stare-down with the percs and an occasional torn fin. Now, the maroon is larger than all the percs and only wants to host from one BTa to the other. The Percs dont go anywhere near the BTA and there is peace as they stay on seperate sides of the tank. I know the reputation of maroons and believe I am sitting on a powder keg. I would suspect that , at some point, the Maroon will just lose it one day and there will be blood shed. Tried introducing a smaller maroon last week but the existing Maroon went to war on him. Now I am just biting time before war begins> Both are gorgeous species a nd I don want to lose either.
Good luck, but hopeless in a 55