May I suggest Emerald Shiners or Bluefin Killifish? They are both super pretty, and native to USA. Flagfish would also be great. This stock would be great:
8 Emerald Shiners or Bluefin Killifish
4 Flagfish
Maybe 1 Dwarf Crayfish, or some kind of Native Gastropod like Bithynia tentaculata
8 Emerald Shiners or Bluefin Killifish
4 Flagfish
Maybe 1 Dwarf Crayfish, or some kind of Native Gastropod like Bithynia tentaculata