Nano fish, not hyper, non-destructive to scape: Chili Rasboras? Celestial Pearl Danios? Glowlight Tetras? (Pretty standard suggestions for nano-by-volume tanks.). Whitecloud minnows, perhaps, though they’re more active. Apistogrammas aren’t too boisterous, if that fits your image. Pearl gouramis are a bit bigger than nano, but typically calm and ‘relaxed’ in their swimming.
Mystery snails, shrimp of your choice, pygmy corydoras are good additions, too.
So not a nano tank per gallons, but nano fish - the Rachel O’Leary nano tank. Perhaps not the best fit in this section, as said, but good luck in the stocking anyway!
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I can only grow plants when they're completely under water. Everything else is doomed.