I put a Kole tang in my tank 2 Sundays ago and by midweek, my green star polyps (about the size of a business card) had a hole in the middle of the mat. I found the remnants on the sand a few inches away. I have lots of algae to munch on so it shouldn't be hungry. I'm hoping it was just to see if there was anything edible in there, since the hole hasn't gotten any larger. The GSP hasn't taken kindly to it and is mostly retracted. Anyone else ever have this happen?