 Heating for Childrens
Having lived in the NT for 16 years I doubt you would need any heating, unless its kept in airconditioning. Be very carefull of using the sun to warm the cage as it can make things too hot and your Childrens would have no where to get away from the heat. Many a reptile has died in this manner. Ensure you have a temperature gradient thru your cage to allow your Childrens to move to an area or temp that suits.
I miss the NT wildlife...a top place. | 
