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The dark green spots is Green Spot Algae (GSA) and can be caused by too much iron, bright light on slow growing plants, low Phosphates, or any combination of these.

The brown residue is likely diatoms and is common in new set-ups and low-light areas.

Otocinclus will eat diatoms, or you can just wipe the glass often until the tank settles in (which could be half a year IME) . For the GSA, either test your water/ferts and dose accordingly, or tinker with less iron and more phos and see if that helps.

-Dave
 
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