Worms Not Migrating to Upper Bin
I have a Worm Factory bin with two bins currently in use.
The upper bin has been active for several months, and I have not placed food in the lower bin for the same amount of time. But the bottom bin still has quite a few worms, big and small.
I am wondering why they have not migrated up since I haven't been placing food in that try, and what they are living on.