Detrivore, Im assuming
At the base of one of my rocks is a weird thingy. It is either a many armed (15-20) beastie or LOTS of worms coming out of the same hole. This is what happens - Occassionally during the day you will see hair sized long (4 in min) "tentacle" coming out from a spot under the rock. They latch onto detrius and quickly pull it back to the hole. They look pinkish red, and have no hair or markings. At night LOTS of these arms come out and go in all directions, pulling stuff back to the hole Which is immediatly at the base of the rock, where the sand meets it.
It isnt hurting anything, and seems to be eating detrius. Any ideas what this might be?