Anyone know what these are? Hydroids?

[Bobby105]

Hi everyone,

I’ve had these things on my frag rack for a while and then now they are on the rock work. I believe they are a type of hydroids but I’m just wondering if I am right and if I am what type of hydroids are they?

thanks
James

 

[JGT]

Tiny feather dusters.

 

[king aiptasia]

holy smokes batman that's a lot of sabellidae

 

[king aiptasia]

looks pretty though, im kinda jelly