I was wondering if many of you raise your own live food? I have 2 water butts which keep me well supplied with daphnia, mosquito larvae and loads of bloofworms. My fish go mad for them and I harvest them every 3 days or so.

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?