What is this?

[FishyLovers]

What are these white dots sticking to the rocks? They're hard, they came in on a xenia frag plug and now they're all over the tank and the glass?

 

[ZANYMASTER]

Nothing to be alarmed.Maybe white coralline?

 

[5thChorseman]

Do you have nerite snails in your tank? The white spots look like nerite eggs.

 

[FishyLovers]

I doubt it's nerite eggs, because I only have 1 nerite snail.
Is white coralline a thing? I would be surprised because purple algae grows in disks, this seems to grow in little dots