Help identifying the hitchhiker worm

[GradoniusTheWise]

I am relatively new to reefkeeping, and I'm trying to identify this worm. I thought it was a normal detritus worm at first, but the antennae are making me think otherwise.

Thank you for any help!

 

[Rocks reef]

That is a polychaete, harmless and helpful part of a clean up crew.

 

[kjkszpj9]

Looks like a dorvilleidae worm, harmless algae eater