I have found this:
Red Headed Agamas should be kept in groups of at least three and provided with plenty of space, they are an active species.
To house a trio (1 male, 2 females) you will require a 48x24x24 inch vivarium, the more space you can provide the better. Use a soil/sand mix for the substrate and position rocks around the vivarium to make hides, ensuring these are sturdy and will not trap your lizard. You can also use cork bark, sand blast branches and artificial plants to decorate the enclosure.
Red Headed Agamas require high UVB rays within the enclosure, we recommend a 10% desert lamp. A basking light will be required to heat the enclosure. You can use a clear basking bulb during the day with a heat mat for background temperatures throughout the night. Red basking bulbs can be used day and night along with ceramic heaters. The enclosure needs to have a basking area of around 35C (95F) with a ambient temperature of around 26-29C (80-85F). Allow night time temperatures to drop to between 23-25C (74-78F). The use of a Thermostat is essential to regulate the enclosures temperature day and night.
Feeding Red Headed Agamas is pretty easy with plenty of live foods being readily available. Crickets, locusts, mealworms, butterworms along with many others can all be fed to your Agama. Youngsters require daily feeding where as adults can be fed every other day. Providing gut loads insects along with a dusting of vitamins will help keep you Red Headed Agama in good health. Provide fresh clean water every day
On this site:
http://www.exotic-pets.co.uk/red-headed-agama.html
Hope it Helps
;D