I just went thru a nasty algae bloom and all the dots were covered by hair algae on the back glass. I was under the impression that the coralline started from lil white dots.i had got those dot's to. id suggest scraping them off glass. alot of it isnt calcium id bet. and no certain time period on coraline growth. i will say since i started using evs 2 part and increased flow and light my coraline growth has dramatically improved
Definitely doesn't look like those. It looks like the circular coralline algea just white. And they are VERY small circles.