What is this worm?

[Darryn Lyon]

Seems to come out at night. I don't think it's a bristle worm. I saw a couple of them. Is this good or bad?

 

[Brew12]

I'm not good with doing ID's but maybe someone else in #reefsquad can help

 

[john.m.cole3]

Bristle. I have one that looks just like this one.

 

[cloak]

Dorvilleidae?

 

[Lionfish Lair]

If you can catch it, maybe throw it in a container of water and take another picture?