For sure! I've been meaning to get the red hawkfish out of my display for forever. I have the trap, I just don't think to do it. I'm going to put harlequin shrimp in every compartment of every one of my tanks and rid myself of them. I can't stand them.I have also witnessed this. It is horrifying peeling them off the zoa polyps. I now remove any I see with prejudice.