What kind of worm?

[HowardJ02]

hey guys, what kind of worm is this? Good or bad?
It is very jittery. I think the only saltwater worm I've seen in a tank is a bristle.. haven't seen one like this.

 

[Lionfish Lair]

Hello little guy! It's probably a Dorvilleidae. Good guy.

 

[HowardJ02]

Hello little guy! It's probably a Dorvilleidae. Good guy.

That looks exactly like them! (I found two while cutting frag plugs)
Thanks for the quick reply!

 

[Lionfish Lair]

I love them. One of my tanks have a bunch!