In all of my outdoor tubs (meant for my livebearers to keep in during the better months of the year), I have a daphnia culture. With the speed of reproduction of daphnia, I'm ensured to have sufficient food for my fish outdoors. But besides daphnia, also mosquito larvae are in ther solely by nature each year. Those mosquitos lay their eggs in there and once they hatch, they're food to my fish. So basically, I don't have to feed my livebearers outdoors.
