Beats me, I guess they just do worm stuff
I find them all the time on nets and wharf pilings and stuff. They may eat algae, they may eat smaller organisms like copepods and stuff. I have no idea but I was told they were good when I found one in my tank.
Christy
This is the one I had:
From Dr. Ron:
"It appears to be a scale worm - probably in the family Polynoidae, Class Polychaeta, Phylum Annelida.
See another example
here
Most of these animals are predatory on small bugs (amphipods, ostracodes) or scavengers. Probably harmless in a reef tank. "