Possible Algae

[Carpman]

I'm not sure if this is Diatom algae or if i'm going mad looking at the tank. There seems to be what looks like a lot of dirt/dust over the top of the leaves. The pics below are the best I can get because of the angle.

 

[tadabis]

Some brown diatoms?

 

[Carpman]

Some brown diatoms?

I cant help you with colour silly old me is colour blind but at a guess I would say brown which is why I thought dirt / soil dust.