wow ... this is a beautiful question ...

as far as i know, earthworms mostly eat dead leaves,, but if tyunning were earthworms i'd put them in a big fat flowerpot with those decorative ceramic houses (even tho they'd probably stay underground most of the time) hmm i'd give them all the dead leaves to munch on and water the pot regularly to make sure they don't dry out,, i hope they repay me for taking care of them by pooping out all the good stuff in the soil for my flower ^^