I am trying to do some research before I make a set up and purchase my squirmers. I was going to start with your basic rubbermaid recyling bin. Air circulation seems to be a major issue, and I have not read through the previous posts, but why couldn't you take a 2-3" wide PVC pipe taller than your bin to extend up through the top & bottom like a smoke stack, drill holes in the sides and put nylon stocking over the ends and do a couple of these in addition to the standard holes in the bottom of the bin, etc. Trying to think this thing through before I take up the drill . . .