Won't be coiled around the base, they almost look like tiny feather dusters that excrete a mucous string as a filter feeder that may irritate some corals. Trying to get a pic of some in my tank, but of course just went to all blue so won't really show up well, but I'll try. They're the small tube like protrusions on the rock. (Idk if they can be made out from this pic, sleepy time for my tank lol)
That's a good thing. Super easy fix for those. If can locate the base you can either crush their house with a screwdriver or the like (just be sure to get the whole deal or they'll retract and come back) or, slap some super glue on their door and just leave the shell. This doesn't mean they won't repopulate or come back elsewhere. I've found that they tend to follow a feeding trend. More particulates and matter in the water for them to feed on, the more they come around. I feed decently, once a day be it coral or fish, and run about 5-10 nit as my softies and LPS like a little dirtier water, so I see them all the time, not plague proportions, but enough to know they're there.
Good call! Knew someone here would come to the rescue!
