I tried to keep two 4-5" little guys in a 265. One tried to eat the other about 37 times They never got along and finally after many seperations and re-introductions I just gave up. The one that stayed is now about 15" and gets along fine with a TSN of the same size but will eventually eat my 12" marble cat when he can catch him head first.
It didnt work for me but give it a try, You never know