Whats this

[Doug]

Its the little orange/brown polyps. Yes, they do look like sometype of colonial anenome. But they have never grown large. Not feather dusters or any worm based creature.

Dont seem to be bothering corals yet. Does yours Christy, as you have lots more coral growth than mine. Will see what I can do about a decent pic.

[dsaundry]

Mine are bigger than that I think. About 1" around..and lots of green..
maybe altogether different....Close up pic if you can..