Green coraline?

[Jake_the_reefer]

This has never been a thing that concerns me but it is more of a curiosity. My tank never got purple coraline algae (just a tiny bit on my main rock from lfs) but all my dry rock in my tank is covered in a dark green algae and I've heard of coraline being green. I'm wondering if this is the case? The green looks really nice during the day and is only noticable with white light when the lights are off. Any ideas what this is?

 

[Jake_the_reefer]

Side note, its only on the rocks none on the sand or the walls of the glass.. occassionally it's on the glass and requires a razor to get it off

 

[Hermie]

is it "round" on the glass? like circular specks that enlarge over time?

 

[Zook1300]

is it "round" on the glass? like circular specks that enlarge over time?

I have the same issue, and yes round on glass that gets bigger, but slow