White specks on glass, like dust collecting

[itgoeson]

My tank is about 5 months old. It has started to get a bunch of white specks growing on (or sticking to?) the glass and back wall. The specks are kind of like tiny threads - they wave in the flow. They look like dust collecting. They are not copepods I don’t think (they are anchored to the glass so they wave around but don’t swim/move like copepods).

I’ve been wiping them off with an algae scraper and it takes about 2 days for them to come back.

I have lots of spirorbid worms growing on my rock and sump - could these be a larval form of those maybe?

Hard to get a photo of such tiny things. Water column is pretty much crystal clear, most of these specks are on the walls:

 

[Redfoxtang]

If it’s easy to pull algae scraper over them and they come right off then it’s probably diatoms. If you literally have to scrape it off, the could be spirorbid worms. But it just sounds like algae to me.