It's most likely just peat moss with "organic" fertilizers added in such as the ingredients they listed to add nutrients to it, bonemeal, earthworm castings, etc.
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!