What is this wrapping around my Palys

[DD0513]

I have this in a pre existing set up that I purchased. I have a lot of palys, but I also have this odd rope like appendage that snakes along the rock and wraps around a couple of the heads.

Thanks for the help!

 

[Crabs McJones]

Eggs of some sort would be my best guess

 

[ISpeakForTheSeas]

I have this in a pre existing set up that I purchased. I have a lot of palys, but I also have this odd rope like appendage that snakes along the rock and wraps around a couple of the heads.

Thanks for the help!

That's a colonial tunicate of some kind, but that is a very unusual growth pattern. It seems like it may be an invasive kind, so I'd recommend pulling it off the palys (if you don't want them being smothered) and trying to isolate the tunicates on their own rock if possible to control the spread as needed. For a decent comparison specimen (Botrylloides niger):
https://www.reeflex.net/?show=galerie&galerieID=84068&galerieCode=67473538e6d23