They live a life almost comparable to that of a sandfish.
That means they need a high layer of dust free round grained sand and they will spend most of the time buried and swimming around under the surface.
Anyhow, they´l come out for basking and hunting from time to time.
A Hot basking spot with temperatures exceeding 110 F is recommended. Also you should use metal halides to provide apt light intensities. The sand has to be heatd by several spots to enable thermoregulation of the lizards within the sand.
To allow them to keep their scales shining and glossy , a portion of the tank should be filled with a moderately moist non sandy substrate liek bark mulcgh /Potting soil.
They are voracious feders which have a tendency to obesity-so do nort overfeed.

Hope that helps

Ingo