Is this diatoms? (Loose brown spots, easy to wipe off/ vacuum).
Diatoms are common in new setup & will go away after a while. Meanwhile general cleaning to keep it from being unsightly is all that is needed.
80 gal FW with 30 gal DIY wet/dry/sump.
9 fancy golds, 1 hillstream loaches, 1 rubber-lip pleco (C. thomasi), 3 SAEs, small school of white cloud minnows, planted.