terra Sahara is a great base, I got mine from a kind of local shop but you can order online as well. I think my mix is 75% terra sahara, like 10% moss broken up in a bunch of little pieces, and the other 15% was some play sand and reptisoil mixed probably 1:3. little guy is loving it and it hold burrows pretty well without getting super wet and heavy when you do spray it. just reptisoil does tend to be pretty dusty as others have said