Black & white worm

[AquaPhilNJ]

I have found numerous of these worms i'm unable to ID. They're black with white stripes (or dots) across top, and I believe a white transparent color on bottom. They very actively moving with decent pace.
worms are usually longer than this picture shows, pop out from inside rock then go into rock again via another hole.

I'm optimistic it isn't a bad worm, but am considering my next steps for removal or reduction. Thank you all in advanced : - ]
Man my coral dip never does the job : | $$ on QT hate to do it.

 

[Brad Waddell Wrath's Reef]

I have found numerous of these worms i'm unable to ID. They're black with white stripes (or dots) across top, and I believe a white transparent color on bottom. They very actively moving with decent pace.
worms are usually longer than this picture shows, pop out from inside rock then go into rock again via another hole.

I'm optimistic it isn't a bad worm, but am considering my next steps for removal or reduction. Thank you all in advanced : - ]
Man my coral dip never does the job : | $$ on QT hate to do it.

Can you get a better photo?

 

[vetteguy53081]

Looks like dorvillidae worm. It feeds on algae and considered harmless although unwelcomed in my tanks