Say it ain't so — this is aiptasia, isn't it?

[Cell]

I'm standing here, waiting for the devil aiptasia that I just found on the same frag to come back out of its hidey hole, and saw these dudes poking out of the side. Are these tube worms? Retracted feather duster worms? Something else?

Don't mind my green algae, which is everywhere.

Hard to tell from the pic but most likely vermetid snails. If the tube is hard and curls at the base, its vermetids.