It depends if you have some drift wood with nooks and crannies that the bully can go into at night where the crayfish cant reach it it should be okay in till you can move it i would make sure the crayfish always has an easy food supply or it will propoly eat the bully :ske: also make sure feed it both meat and veges Also big bully i had one about a pencil and a half long but it died :cry1: :an!gry &c:ry :tears: