The first that comes to mind are a small school of guppies or a single betta. But if we’re being honest, I have a terrible time remembering types of fish and their requirements… So if any of my followers want to chime in, feel free to do so!
Any sort of dwarf or pygmy rasbora, a single domestic betta, a pair of wild b. splendens or b. imbellis, a few guppies, or the small tetras like neons and glowlights would work. You could also do some African dwarf frogs.
BettSplendens Tumblr Evac 