I currently have them on Repti Bark & sphagnum moss. The moss is in the hide & along one side of the table. The bark just seems to dry out so fast & loose humidity.
I would use the sphagnum moss. How big is your tort? If bigger that 4" you can use cypress mulch. If you go to home depot you can buy 2 sq. ft. Of it for $3.00.
So we went on a search for cypress mulch today and were unsuccessful! Lowes, Home Depot & Ageay didn't have it. So strange considering you can get it anywhere in the south. So we decided to do the coconut coir. Holy hot mess!!!!!! Hoping it works well.