Are these pests? Or okay?

[Garcia2460]

Can someone please ID this worm? I found two of these under a frag in my sand bed

 

[Crabs McJones]

Common bristleworm. Good clean up crew. Keeper

 

[JGT]

Can someone please ID this worm? I found two of these under a frag in my sand bed

Bristle worm. Will clean up detritus in your sand bed. I’d put him back.

 

[Ryan hirano]

bristleworms. get a wrasse, they'll eat them