Can someone ID this

[flchevygrl]

My boyfriend got this at a frag swap and a few days ago he
noticed 3 of these on the rock.
Thanks in advance.

 

[tigger2577]

Looks like a feather duster to me

 

[flchevygrl]

He was afraid their aptasia..I probably spelled that wrong...lol

 

[Webmanny]

Feather Duster worms. Perfectly fine to keep.

 

[Ted_C]

Nope - not aiptasia - definitely a feather duster.

 

[anbosu]

Feather duster, in case you needed to hear it one more time.