As I expanded from one BP to three I picked up a CSerpents 3-tier rack, which is awesome. However, I'm having a hard time keeping the humidity up in there. I actually had an easier time when I only had one BP and I had her in a 10-gallon tank. That had a wire mesh cover, but I put saran wrap over most of it and was able to keep the humidity exactly where I wanted it by opening up the saran wrap a bit more or less.
I started using Coco as substrate for one of the tubs and that seems to keep the humidity up for a bit, but then it dries out again. Hmmm. Any ideas?