SPS-eating Fish

I had a frag of a three-headed Hammer Coral fall and land between the Orange Montipora digitata and the ORA Green Bird's Nest corals. It wasn't more than 24 hours contact time, so I thought there would be a little bit of loss. Over the course of a week, however, I noticed that the corals kept loosing more and more tissue. The white skeleton underneath kept getting more and more exposed!

After careful observation, I noticed that my Pygmy Angels, especially the Coral Beauty, were picking only at the weakened tissue. Given more time, I think the fish will just work their way around the entire colony. Then, I noticed the Coral Beauty picking at the new SPS frags that I just transferred over.

I've decided to ask around for a fish trap on the hobbyist boards because I'm not going to be very successful trying to grow SPS frags with the Pygmy Angels always on the hunt.