Brown/Green Algae ID?

[Secky]

I’ve set up a new 25g tank and I’m going through the dirty stage. Got like this brown algae first thought it was diatoms however when I turned my LED to a more higher whites I’ve noticed that the algae looks green? Is this still diatoms?

Picture is algae under whites, looks brown under blues.

 

[Timfish]

Probably a mix of species. What I do sometimes with any nuisance algae or cyano growing on sand is siphon off the surface layer, soak in H2O2 for a day or so, rinse well with fresh water, let dry for a few days then return to the tank.