tiny white spirals

I have tiny white spirals growing on my glass and some rocks. They are pretty hard, even with the metal scraper they are hard to get off. What are they? I cant post a pic cus you cant even see them in the pictures.
 
some kinda pod.
I have them in my nano too.
Not sure what they're called. I quick google might bring up some names.
Anyhow they're some type of feather duster I believe.
Not harmful, not sure what they say of water quality, hopefully something good cuz I have millions of them.
 
They are a worm, from what I have been told. Completely harmless and can be scrapped off the glass if bothersome.....
 
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