ID on these tiny critters on my glass

[blabay]

I clean the glass at night and in the morning these tiny white things are covering the glass. I dont see them move and there are long strings (mucus?) coming out of them. Are they some kind of worm? Good or bad?

 

[shakacuz]

just seems like buildup of film algae, or in worst case could be the start of dinos/lyngbya?

if you have any wrasses, anemone's, or types of leathers- they shed a mucus-like skin which could be this. some wrasses make a mucus cocoon when they sleep. anemone's will shed, in a way, when moving from one spot to the next after being in place for a while as there is detritus that builds up and could lead to this. some leathers shed their skin as they grow.