The general consensus on this site is that you shouldn't use sand as a substrate, due to a chance of impaction and possible bacterial issues from feces unless it's completely "exchanged" regularly. I have no experience with this particular product.
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!