Bristle worm?

[Searchin]

Got a new set up going on. Just bought some new rock too. Is this a bristle worm? Is so, is it a keeper or do I need to kill it. I also got a single ( as far as I know) aiptasia... I'm hoping this rock doesn't have too many more surprises.

 

[Ricksreef]

Yes it is a bristle worm ,keep it as part of cleanup crew.

 

[egrape]

bristle worms are good, they are the only thing that clean up detritus inside the live rock!