I have been growing out a CK in my grow out tank. Its hit the 7 inch mark now, but the larger tank I want to move it in has a 4 bichirs ranging from 13-18 inches with the 18 incher being an endlicheri bichir (I have 2 ornate bichirs and 2 endlicheri bichirs). At what size will it be safe to put the CK in with the bichirs?