There are soooo many choices for potting media. Right now many of my phals are in pure NZ moss, some with - some w/o styrofoam peanuts in the bottom of the pot.
Moss is OK, depending on your growing conditions. For me, it dries out way to fast and it can be toublesome if you pack it too tightly when potting.
As my Phals require repotting, I pot them up in a bark, NZ moss, charcoal, and sponge rock mix that I make. Clear pots are great - I can and they can see the light!!