The article in the main TAS site doesn't mention the official treatment for scaly leg mite Liffy, which is Benzol Benzoate (or Benzoate de Benzole over here). Used on humans for scabies, it is very effective. Very cheap from the vet but we had to buy from the chemist and needed a vet prescription to do so. Brush it up the scales with the bird standing in a tray.