I had a coral banded that killed almost any fish that got put in the tank. I couldnt figure it out. Just health fish one day dead the next. He wasnt eating them or anything. I know was him when I watched him grab my niger trigger and killed it. That was the last fish he would kill. Hes now gone and havent lost a fish yet. Too bad took two yellow tangs, a unicorn tang, a couple wrasses and niger trigger to figure out he was the culprate.