Is this a red tube or fan worm? Is it harmful?

[buckeye_man18]

Is this a red tube or fan worm? It's on the underside of my open brain coral. Appears to be two of them. I believe I also have one on the stalk of my hammer coral. The "plume" or "fan" is a pretty bright red, although it's hard to see that from the photos. Are these harmful? If so, how do I get rid of them? Thank you!

[samnaz]

Not harmful. I have lots. I let them be in my tank.