Personally I am not a big fan of aspen. It seems to get nasty a lot quicker. I have noticed mold around the water dish if a little bit of water is spilled out, which happens a lot. I was constantly having to mix my bedding around because if it sat on one place with a little water in it then it would start molding.
I use coco fiber, which is what eco earth is, and i love it. It holds humidity very well and masks odor much better. I also dont get any more mold or discoloration if it stays damp in one spot. As far as it getting too humid, i wouldnt think you would have a problem. as long as you have enough holes in the tub for ventilation then you should be fine, and you can always put more holes if you need to.
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