I have four Angel fish. One is missing one of his ventral fins. Two have broken ones. The only thing new I have added to my tank is two very small chinese algae eaters. I don't know if they've just hurt themselves or something else has happened. I haven't seen no aggression in the algae eaters but I'm not watching my tank every second either. Anybody have any idea what I can do to help them or if I made a big mistake adding the CAE's.