Ok i want to know why my CKF kills some fish and others he leaves alone. Now i guessing there really is no awnser to this. But my CKF is fine with alot of fish and others he kills soon as i put them in the tank. I have small fish like cory cats, a small datnoid, a small green serverum that he doesn't bother with them at all. Then like today i put a Jack Dempsy in there about the same size as the Datnoid and Serverum and he kills him. I dont get it. Anyone have any ideas?