While admiring my tank via the CSL moon lights (love them lights), I noticed what looked like a worm crawling out from a rock. It was dark colored and when streched out maybe two inches long with what appeared to be a small crown of feathers at its head. It moved just like an earth worm and really looked like one. When I hit it with the flash light, It retracted back into a small whole. I noticed the same this when I examined my pipe organ coral. The other was about 2-3 times the diameter and looked like it was trying to pull a little while dot off one of the pipes. perhaps it was putting the dot their. Unfortunately I have no pic as they run from light. Any ideas what these may be??