i have had a little luck breeding them, i have my first clutch of eggs incubating now. We'll see what happens.
My guidelines are like this(really easy)
temps in the mid 80's
deep mix of potting soil and sand, i leave one end damp all the time. The humididty is probably 60-80% at all times in the enclosure. I keep 1.2 and i NEVER see them. They dig down and stay down for weeks at a time. I notice that when i really spray the enclosure in the late afternoon, that they will come up and look for food. In the wild they follow the moisture, so as many people have said, i think people are keeping them too dry. They are from dry regions in east and northeast africa, but they dig into the banks of rivers, and probably stay there untill it rains. I have talked to many african collectors, and they say that they almost never find them on the surface, day or night. they dig em up. good luck, they are fun.