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A single betta would be nice.
Shrimp are cute but can be sensitive. Mystery snails are fun to watch. They will climb up the sides and then dive bomb back down.
Ramshorn snails breed quickly so you could sell any extras.
Pea puffers are adorable so if you have one (or two if it's planted heavily enough)in one tank and snails in the other you have a food supply for it.