Weird curly worm thing on glass

[francis]

I found a bunch of these things on my glass the other day. They are hard and do not easily scrape off the glass. Any idea what they are?

 

[Bonessurf]

Looks like a tube worm. A feather duster maybe?

 

[Sergie]

Spirorbid worms. They're harmless filter feeders. They spread like wildfire if nutrient levels are high.

 

[AquaRick]

Looks like planaria.

Aquarium FD - Planaria Small Hair like White Worms - Disease Identification, Diagnosis & Treatment

 

[francis]

Thanks everybody, I'm going with them being the Spirorbid worms after looking at the pictures. It says high nutrients so I will be doing my water changes tomorrow. Just haven't been home for a few days Thank you everybody! and here I was thinking it was coraline algae when I glanced at them