I would do a school of 6 neon tetras and a dwarf gourami...or if you have a betta that doesn't mind tetras then I would have a betta instead of the dwarf gourami. Or maybe 3 ADFs and a few platies and a bunch of ghost shrimp. Or 6 female bettas and a snail...or a single paradise fish...or a shell-dweller tank, I know nothing about them but would love a tank of them, as they seem pretty cool. Ok my last one, divide the tank into 4 sections and have bettas.