The algae is normal... its just unsightly, but nothing an algae scraper can't remove.
I guess you have a nice coating of various algae on the tank glass and equipment because there aren't any otocinclus in the tank at the moment. If your tank is cycled, can just introduce 1 or 2 small otocinclus into the tank, and they will happily munch up all the green algae on the glass and equipment within a day (except the green spot algae, those usually still need algae scraper to manually remove completely).
Alternatively, you could also just add small nerite snails instead, just 1-2 horned nerite snails will do the same job (but abit slower), they'll also help eat up abit of the green spot algae too.
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