Dehydration is a great way to wipe out a batch of pinheads. I used to breed my own and I just put some lettuce(usually one or two romaine leaves) & carrots in every other day or as needed, and that was enough for them. I fed them ground-up dog food with some grains and vitamins mixed in too. You can use any fruit/veggie with moisture, but carrots seem to last longer.
Don't have any water at all anywhere near the container, these things are quite possibly
THE stupidest creatures on the face of the earth - I had a tiny spill once(seriously, maybe 1/2 of a pop bottle capful) and came back to see literally dozens of bodies surrounding the water with heads in the water, drowned. Honestly, I'm surprised evolution let them get this far...
Here's the site I used to help me set up my breeders(I didn't do it on such a large scale though) -
http://chamownersweb.tripod.com/Othe...he_house_c.htm