After reading more through this very insightful forum I have learned that I should keep a cool, dry area for my Tort aside from a warm, humid area. I am having no issues keeping my hatchling Greek's humidity up (reaches 80-99% at times, at which point I open the lid to his enclosure). My issue is that my night temps go down to as low as 72F with humidity still in the 70's%. I am using coco coir as a substrate and as you know, it retains moisture well. What other substrate can I use that will keep the cool end of the enclosure dry? Can I just place that substrate on top of the already moist coco coir? My tort spends most of its time burrowed on the warm end. The only time he ventures away from the warm end is to eat, and his eating area is in the middle of the enclosure.