Im not a fan of sphag because it is not a renewable resource and its good qualities go away really fast. Sphagnum moss when live is a cation exchanger, meaning it takes stuff like magnesium, and calcium and other minerals in water, and replaces them with Hydrogen, making it and the water acidic. This is one of the reasons why it is so good at being antiseptic. Once the moss dies, its not making any new Hydrogen ions, therefore you will be washing away its antiseptic properties with every watering, wash etc... Eventually sphag moss is good for nothing other than to keep humidity high.