crazy white centipede looking worm

[Akida17th]

Was wondering if anyone can ID this worm (link below) that I noticed last night in strolling up my refugium. Seems to be a herbivore eating algae but I'm not entirely sure. Thanks!



https://www.youtube.com/watch?v=Y_BfxIUSOBk

 

[Pete polyp]

Dorvilleidae possibly