Of course, permethrin, which I believe is the active ingredient in Nix (as well as other commerical mite sprays) has been linked to birth defects in lab animals, and has been known to be fatal in young/small animals - even at low doses. As always, these type of home remedies can and do work, but they're always use at your own risk. Do more research on your own on the chemical, its uses and effects than a few forum posts. Don't learn the hard way.
There is a fine line between a hobby and a mental illness.