Weird curly worm thing on glass

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francis

Aquarium Advice Freak
Joined
Jan 16, 2011
Messages
375
Location
California
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?
 

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Spirorbid worms. They're harmless filter feeders. They spread like wildfire if nutrient levels are high.
 
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 :p Thank you everybody! and here I was thinking it was coraline algae when I glanced at them :p
 
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