Please help ID these cowboys riding my snail

[Scooters Reef]

Not sure if they are feather dusters or aiptasia but fairly confident it’s a worm. I am new so looking for any clarification before I put into my display. Thanks.
First post. Lurker for long. Finally starting to get hands in reefing.

 

[Mattyreefs]

Looks like feather dusters

 

[Turnage]

It almost looks like aptasia. Feather dusters actually have a little bit of color/pattern in them, aptasia doesn't. When in doubt get it out!!

 

[Big C]

Looks like feather duster with the tubes attached to the shell.

 

[F i s h y]

Dusters

 

[Scooters Reef]

Thank you everyone for the fast replies and input.
they are definitely coming from a tube structure and when the snail starts moving after being still. The fan / head retracts into the tube. Or seemingly anyways.