ciclads

Hi All. I have a 30 g. Tank of South American Ciclads. My tank consists of Parrot Ciclad, Red hump Eartheater ciclad, pleco, Green Terror Ciclad, and a red devilcilad. I just lost my Keyhole ciclad and black tail shark to a fish attack. I am not sure wich of the fish caused it. As I have...