Say, Any of you ever watch in horrific belief as your fish, in this case a five year old mandarin, was being pulled in as I tried to get its carcass out of a very large rock, by a bristle worm the size of my index finger. It pulled it into a deep hole in the rock which was immovable due to its size. Could lift it, as everything shifted, but that was all I could do. In looking for the mandarin after a few days of it missing, I looked with a flashlight everywhere and there under the largest rock it was still being consumed! Have also seen them wrap around button polyps. It is time again to trap them. Some are usefull, too many create havoc. The mandarin always slept at the base of these large rocks, and I always feared that one of the larger worms would get it at night. Witnessed one approaching the gramma that used to be part of my group of fishes and had I not grabbed it with my tweezers, it may have injured if not worse, the gramma. 'course, it broke off leaving just another worm to grow back. Any of you see this stuff occur in your tanks?