Yup, I think you’ve guessed it. Lights are on long, and the moss is high/close to the light. Your plants aren’t dense enough to take out all nutrients, and are probably done photosynthesizing with hours to spare. That leaves the buffet open to the algae. Toothbrush cleanup can help, along with shorter light time. If you get a fancy light with ramp up and down, that could keep the tank viewable for a longer time while still cutting back on algae.
Also, consider adding more cherries, more plants, and sharing more photos (looks nice). That sword is a small/micro variety? If not, be warned. They can get a bit big. If that happens, look to the silver lining: set up a new larger tank with a great matured plant, and drop in something new for your nano.
Did you double post this, or am I just getting weird deja vu?
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I can only grow plants when they're completely under water. Everything else is doomed.