Spot algae?

I just added a MH fixture to my tank and have noticed growth of little spots of algae on my glass. It's happened over the course of a day and a half so I doubt it's coralline. :(

Right now the spots are too small to get a picture of, but they've very reminescent of the green spot algae seen in freshwater tanks. Can anyone give me some sort of idea of what they might be or at least a direction I can start to find it myself? I'm not familiar with SW algae.

Thank you,
Phil
 
Most likely growth of some kind of single celled algae. Could be any one of quite a number ;)
 
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