We made compost bins out of large garbage cans last year. We drilled holes up and down the sides and on bottom and used half inch hardware cloth to make an aeration tube up the center. Then we moved from north Texas to Central Texas a few months ago and took the composers with us. I found black soldier flies in the composers after the move, and for a long time I had a lot of larvae whenever I opened one to put materials in it. Now I don’t see them in there anymore. I suspect they inhabited my composers in north Texas and didn’t thrive in the new environment.