I have come to the conclusion that I might have the most aggressive bgk. Today I added a new loach to the tank and the loach went on the other side of the log to which the bgk normally hides. Well he decided he wanted both sides and has literally chased the loach across the tank and has repeatedly head-butted the loach. And he pretty much always chases after my cichlids and probably has been the reason why a few of my fish have disappeared/died.