it still isn't that bad at all.
the stuff on the sand, does it look more like brown/gold dust? if so then they are diatoms, harmless and will go away on their own. you will only drive yourself crazy if you begin messing around to get rid of diatoms. They feed on silica which is in higher concentrations in new set-ups. as the silica gets used up, the diatoms will die off. Usually takes anywhere from 2-6 months total, but can re-bloom if new sand/source of silica is added.
it does look like there is a few spots of brown cyano
, the slimy looking stuff with bubbles in it.
from the amount of algae actually there, simply cutting back on the lighting and maybe feeding should help.
You are a long way from having a nuisance algae problem, trust me.
Remember, algae isn't a necessarily bad thing, it WILL grow no matter what, the trick is controlling how much and where it grows.
If you begin mucking around a lot to try and "fix" the algae, that is asking for more problems.
reduce lighting and food is the first step.
if it is really bothering you, take a toothbrush to the rock and gravel vac the sand.