Age doesn't have an impact on whether dinos form a "mat" as part of their growth pattern.The tank is 6months old. Idk Dino’s wouldn’t make a mat in such a new tank?
You're going to get all types of algae growth as the tank matures... don't fight them, just try to keep them in check when they occur! Their presence is needed and part of the tank maturing.
This looks like you are getting a photosynthetic type algae to form a little. Just ride it out and see what it turns into.
If you are really concerned, buy a microscope and rule out dinos. I bought one just so i wasn't guessing what i had in my tank... helped me greatly.
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