Baby bristle worm?

[loneboat]

Found this guy in the sand right at the edge of my DT. Is it a baby bristle worm?

 

[AllSignsPointToFish]

I'd say that my initial thought is the same as your...small bristleworm.

https://www.lionfishlair.com/hitchhikers-guide/polychaete-dorvilleidae/

 

[flsalty]

With those eyes I'm more inclined towards sand worm.

 

[KJ]

Look like Syllidae sp.

 

[fLajNuT]

Look like Syllidae sp.

Are these harmful. To humans or corals and fish?