I put a liner down under my bark and some coco coir so I can keep it a little damp so it doesn't rot the wood and that runs the humidity higher.
They sell humidifiers that will help if needed but I think if you get the substrate right you won't need it. I have a repti-fogger that I keep on a timer for one of my enclosures but it only kicks one twice a day.
You can also put some plants in there inside the pots and that will help too
Adding a liner may not be a bad idea. I initially avoided it because I was afraid he'd try to take a bite. But I doubt he will. What type of liner is best to use?
Thanks