I'm breeding Dendrobaena Veneta. I'm keeping them in substrate made out of a little bit of dirt and soaked rabbit and chicken (with calcium) pellets. They're in a plastic container (60x30x30cm) and I've taped the top to prevent them climbing out. I throw in some coffee grounds, veggie leftovers and the soaked pellets from time to time. I keep the container outside except in the winter, because of the low temperatures. I'm needing a lot of worms for my salamanders and newts, but in this setup I can harvest 30 worms every 2 days. I started with 1 kilo of worms.