Help! What is this on my rock

[CierraBeckwith]

I’ve attached a video, it looks like maybe where I had a feather duster previously but it died, and now it’s a white small opening and there’s what looks like clear strings coming in and out of it (almost looks like something filter feeding?) I’m not sure what it is. But there’s one other in another spot in my tank. It’s small, but it’s the white spot in the middle of the video if you can see it. Thank you for any help!

 

[EeyoreIsMySpiritAnimal]

Probably something in the family Spionidae or Chaetopteridae. Either a Spionid worm or Phyllochaetopterus would be my guess.

 

[CierraBeckwith]

Probably something in the family Spionidae or Chaetopteridae. Either a Spionid worm or Phyllochaetopterus would be my guess.

I think it’s a vermitid snail maybe I did some more research, does it look like one of those?