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Mine just appeared in the the water butt and the population peaks and falls naturally. To keep them fed I put out a bucket of old tank water from a water change and leave it in the sun for a week til it turns green. Then I add it to the daphnia. The mosquito larvae just keep turning up all over the summer; they seem to be the favourite live food. If you want a starter batch of daphnia I'd look in shallow ponds that get plenty of light.
It's a very large barrel, as Mbou says, we use them to collect rainwater.
why would you collect rain water?