Killer Fish

In case anyone is curious about the fish in my aquarium that has killed almost all of its tank mates, here is a video of it. This is my black-banded lepornius which I have recently bogged about, on both December 19 and 31. Perhaps it is my fault this fish decided to eat his companions. Maybe I hadn't fed them enough. The last time I fed the fish, I thought I put too much food in, but the lepornius quickly ate it all up.