A solution to a ghastly problem:
I have rescued many birds in my time and for some reason they all have come with scaly leg mites. I have a quick and safe way to deal with this and help your birds heal with a little time and dedication. While your new bird/birds are in quarantine to watch for any illnesses or unseen issues you can smother their legs in Vaseline. This will not only smother the little mites but it will allow their legs to heal and the scales to come off over time. I have had this take anywhere from a couple weeks to a couple months. Check on them daily and keep their legs covered and you will soon have one less chicken problem on your hands.
