Not only do red foot tortoises need space, light and heat, but it is also essential that they remain moist. Rain forests are damp and humid places, and that is what red foots have adapted to. Dry conditions can lead to lung infections and cracked skin. As Toronto is quite dry (especially in the winter), we've had to be very vigilent in keeping the humidity level in Basil's terrarium high.
We found that the 6 inches of cypress mulch was critical to maintaining an appropriate humidity level. Initially, we used a simple plant mister on a daily basis to manually spray down the mulch and moss. Attempting to automate the process of keeping Basil's environment sufficiently humid, we first used an IV-like system that dripped another 250 ml. of distilled water into the tank every day (we used distilled water to avoid problems with Toronto's hard water). However, that system led to wide swings in humidity.
A friend of ours, Brian Hambleton, came to the rescue and built a humidifying system similar to the misting system in the fresh produces shelves of grocery stores. The humidifier system had a large (10 litre) reservoir that fed the pump system. The pump was a simple automobile windshield wiper fluid pump controlled by a Basic Stamp microprocessor. The Basic Stamp microprocessor was programmed to give full control over the misting cycle. We had it set up so that it sprayed out of two nozzles for about 2 seconds every 10 minutes. This maintained a humidity level of between 70 and 80 percent.