I had a tiger cowrie pretty much decimate my old zoanthid collection before I figured out who was responsible for the losses and then again before I was able to catch him out in the open and remove him.
Ironically enough, now he's in a tank where he could eat all the polyps he wants (rock infested with mushrooms, aiptasia and brown palys) ... he could eat them to his heart's content, but doesn't touch them. Apparently only expensive corals taste good.
