Can anyone ID these?

[taima1shu]

Just noticed these things all over on my glass, anybody know what these are? Good? Bad?

Thanks for all the help!

 

[nautical_nathaniel]

Little flowerworms, not sure of the species or actual common name. They're a harmless filter feeder for the most part but they can be a pain in the butt to keep off of the glass.

 

[KJ]

Spirorbid worms filter feeder.

 

[nautical_nathaniel]

Spirorbid worms filter feeder.

That ^