Already been removed and I am all but certain they are bristle worms. The faces have absolutely no "tendrils" or "jaws" of sorts like you'd see off the mouth of a Eunice or Bobbit. Unless it's a eunice that looks exactly like bristles, pretty sure they were just really massive bristle worms lol I removed two the night I got that video as they came all the way out for the first time I've seen. Didn't bother with pics/vids, just wanted them gone hahAfter watching that video and seeing how the tail doesn’t taper… that no longer looks like a bristleworm however I can’t see the face to confirm it’s what I believe. It looks to me like a Eunicid species, they can go years undiscovered even if fish don’t go missing.
In many cases, getting rid of them is a nightmare and it does end up being people have to get rid of the rock. I cant tell if the bristles are being used as feet though. Eunice worms use their legs to walk and can go at quite some speed. I’ve combatted about 5 in the whole 10+ years I’ve been in this hobby.
Bristleworms will have their tail taper however Eunicid species do not have a tapered tail, you will often know of the Eunice species as Bobbitworms however it’s usually only 1 species commonly seen, Eunice aphroditois. The other species can often come in though.
This is just from my eye without glasses on (Screw eyesight). Hopefully if you can get a photo of the face we can rule out bobbitworm.