Algae ID - Grows on front glass

[Acros]

I have not cleaned my glass in about 2 weeks and these have been growing on my front glass for more than a week. It is red-brown in color.

The back wall has hair algae growing on it. The tank is 4 months old.

Under white light.

 

[Webslinger]

algae will grow great on glass. and that's the start of it

 

[Acros]

I scraped off very easily and was floating around the tank for a while. Any idea what kind it could be?

 

[AlgaeBarn]

Hard to tell from images, but just looks like film or hair algae growing on the glass. ~Shaun K.

 

[Webslinger]

common algae