Just noticed a few new worms. ID please

[jprince]

Hi

I have just noticed these tonight. They are on several rocks and are no bigger than a quarter to half inch. I have no clue as to what they are. Any ideas? Thanks.

 

[Fluff]

It's a common bristle worm and nothing to worry about.

 

[roka64]

I consider them a great addition to my clean up crew.