Green dots on Rock????

[Joe14]

So I'm getting these green patches on my rock and I'm guessing its the start of algae, all my parameters are in check my nitrates are lower then 10ppm, my water change is thursdays. Can someone tell me what it is?

[Salty Dog24]

pictures speak a thousand words!

[Joe14]

they don't show up on pictures they are very faint

[Sugar Magnolia]

It could be the beginnings of coralline algae, or film algae. Hard to say.