What kind of hitchhiker worms do I have? Video included

[Apayson]

Hi all,

I added uncured live rock to my tank a few weeks ago (unwise)
I'm overdue for a water change & now see all these worms on the glass.

When I zoom in on them they do have bristles...What do y'all think these are?

Thank you

PS
The only live stock in the tank is a turbo snail & 2 of those zombie snails that chill in the sand

2 Videos attached below

 

[Soren]

Look up dorvilleidae worms to see if you have a match.
That is my first guess based on my experience and research, and I'm fairly sure it could be the correct ID from what I can see in your videos.

Edit: I should add that dorvilleidae worms are typically considered harmless CUC.

 

[Apayson]

Yea they do look quite similar to that...I hope that's what they are, thank you!