There are alot of opinions on this subject If you decide to use the high constant humidity method (80+ % humidity levels) please do not let your enclosure temps drop below 80 degrees ever
Welcome to the Forum. I believe that the best way to raise a baby sulcata is in a "closed chamber" enclosure. When their basic environmental needs are met they are active, healthy, eat and poop regular, and make enjoyable pets. The "closed chamber" gives, in my opinion, the best opportunity for controlling the temperatures and humidity that are fundamental to their environment. Here is a link to a thread on closed chambers. http://www.tortoiseforum.org/thread-65606.html