Hi! I noticed a nasty lil worm thing moving, inching its way out of a hole in the rock. Obviously I was curious to see what the heck it was so I turned the tank light on and it shrunk back in the hole. I'm new to saltwater tank keeping so I just want to make sure this isn't a harmful parasite of some kind.... I googled it and there was a few things it told me it could be. I want to make sure I know exactly what it is, since I don't want it to eat the anemone that is living right next to it. Thank you!! :]