You might consider making one of the hides a humid hide, too. My biggest ball loves hers that's just a dog's water dish with a coconut fiber liner for a hanging plant basket turned upside down over it with a hole cut in the side. They come in a few sizes and can be found at most plant or garden stores for about $8 or less, have a little weight to them and are easy to cut into, mist on, rub on for shedding, and lift off when needed. Plus, no mold yet.