Baby bristle worm or something more nefarious?

[Nierika]

I saw this guy moving across the glass last night. I thought it was a bristle worm but now am not so sure. This is at 25x magnification.

Here's a quick video (it gets blurry after the first few seconds)

 

[Dennis McGrath]

Sure looks like a bristleworm to me.

 

[Lovemyreef2015]

dorvilleidae worm. Good cuc