I would not suggest bark. I have gone through many types of substrate, and find a problem with each of them. It is mainly just your preference. I use the reptile carpet in my display case. Some people just use paper towels. It depends if you want something asthetically pleasing, natural for your animals, or practical to clean. Good luck, let me know if you come up with something that works good.
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------Misty-------
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More pets than one room can hold. I listed them all but it looked ridiculous!!!
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