As you know, in some areas of the country there have been grave concerns about the introduction of invasive earthworms into local environments. Eisenia foetida can be one of those invasive worm species. There is a discussion here with further references about how to manage your worms so that they don't become an environmental hazard.
http://www.wormpost.com/worms/...
Love the idea about soaking the cardboard in a large container (mine is an old bathtub).
