I have a small flock of bantams and standard size chickens. Some of them have scaly leg mites, some of them have lice, some of them have both, and some of them have neither. I know that I need to treat all of the chickens though. Some of my bantams are feather footed, so treating the scaly leg mites externally doesn't work very well. Is there some sort of oral or topical medicine that will treat both the scaly leg mites and the lice?