Spirorbid worm?

[Reef Quest 11]

Hi All, first time posting.

Tank is 3 days old, set up Sunday with live rock and live sand. Was given 3 starter corals. GSP, a zoa, and a Kenya tree.

we were checking out the tank before bed tonight and noticed all these white little shells and white hairs showing up. Picture captures most of it pretty well. So did we ID them correctly or is this something else entirely?

 

[Tahoe61]

https://www.reef2reef.com/ams/guide-to-common-hitchhikers-in-reef-tanks.861/

Spirorbid