varanustalk.net
Small forum, but tons of great advice. If you post the above overthere put up some pictures of your enclosure etc.
The cage you have even for a baby is pretty tiny, most have had success putting them in their "forever" enclosure right off the batt, 8in of substrate is better than some have done in a 40 gallon tank, but again most suggest at least 2ft of substrate to ensure they can burrow, stay hydrated, etc. What are the specs on your tegu enclosure? I basically keep my Tegu the exact same way most house their Savs except I keep a higher humidity.