I have seen cyclops in the mid-Atlantic region as big as daphnia. If they get into a daphnia culture, they will overtake it and it will become a cyclops culture. They can be cultured the same way as daphnia, quite successfully. If you introduce some large ones into a tank of itty-bitty fry, they will provide newly-hatched cyclops for food, and filter the water, pretty much like daphnia. Bob