Need help ID this worm!

[Indeco]

I found a few of this worm crawling in my sump. Is this beneficial or harmful?

 

[Anemone]

The photo definition isn't good enough to really identify the worm. Sorry.

Kevin

 

[Indeco]

I'm sorry, will try to take a better picture later.

 

[mcgyvr]

See if you can identify it yourself here..
https://www.lionfishlair.com/hitchhikers-guide/
Maybe a harmless Polychaete - Dorvilleidae

 

[Indeco]

See if you can identify it yourself here..
https://www.lionfishlair.com/hitchhikers-guide/
Maybe a harmless Polychaete - Dorvilleidae

After looking through, Polychaete - Dorvilleidae is the closest of all.


Anyway I uploaded a better picture for reference.

 

[mcgyvr]

Probably it.. They are quite common and harmless/beneficial