Are these white things some sort of worm?

[ekopapers]

Like the title says I am trying to figure out if these are worms or something else I should be worried about, I took the pics after my lights had been out for like an hour so everything is all closed up but in the day both the Duncan and blasto look great so they don't seem to be bothering them as of right now

 

[KJ]

Feather duster.

Serpulid - Google Search

www.google.com

 

[ekopapers]

Feather duster.

Serpulid - Google Search

www.google.com

They aren't a tube structure so I don't think it's a feather duster and other ideas?

 

[vetteguy53081]

Likely tube worms but very similar structure to hydroids, but I say tube worms