I use coconut coir. I'm not sure if its the same your talking about, but either one you can use. Btw, incase you haven't read them yet. Toms threads on raising a healthy, smooth leopard are listed at the bottom of my post. The sulcata ones will apply also.
Same product I use and its great. Never molds. Have to watch the moss for fungus, molds and in some cases sprouts that may or may not be toxic. I had that issue with my moss in Benny's humid hide.
Hope you will take the time to read through Toms threads on raising smooth. It's amazing the amount of misinformation that's provided by vets and stores about these awesome animals
Two kids, One husband, One Hines57, One Leopard Tortoise, and a room at the sanitarium lol