Bristle Worm ID

[kona]

Just wondering if this particular bristle worm is detrimental to the tank.
One of my ricordea polyps was all shriveled up, and when I inspected it, I found this 1 inch worm underneath it. I put it in a ziplock bag so I could take a good picture of it.
Should I put it back in?

 

[kona]

one more

 

[kona]

Further research indicates that this particular type of bristle is beneficial. But does anyone know how they affect corals? My ricordea has been shriveled up all day because of the bristle worm. If the bristles are strong enough to penetrate human skin, couldn't they really harm a soft coral like a ricordea?

 

[bang guy]

The worm pictured cannot harm a healthy Ricordea. If the worm gets careless the Ricordea might eat it but that's the full extent of any possible interactions.