When we brought our girls home, they had mites as well. After considering the options, we chose to use DE as well. Picked up a bag of food grade at the feed store and mixed some in with their litter and dust bath and within a week, the mites were gone. It wasn't a massive infestation but I haven't seen a single one in nearly 2 months. We continue to add a little DE to new bedding and when we top off their bathing boxes.