As the dragon gets older it will need a much bigger enclosure. A full grown bearded dragon should have at least a 55 gallon tank or a cage measuring 4' x 2' x 2'. When the dragon is an adult the substrate can be either of the 2 previously mentioned substrates or it can be sand. This should be a sand that is specialized for reptiles such as calci-sand or desert blend sand because they are very fine grade and reduce the risk of impaction. The tank or cage should also have a number of logs for basking as well as hiding areas.
Heating is a very important aspect of bearded dragon care.
If temperatures are too low the dragon will not be able to digest its food properly. At night the temperature should drop, but never below 75 degrees. To provide heat, use a basking light in combination with a sub-tank heating pad. The bulb for the day should be 75-100 watts depending on the height of the cage. The heating pad should provide enough heat at night, but if you find that the temperatures are dropping too low you may want to use a night bulb of a smaller wattage than the day bulb.