As you know, I have a proline too, and all I use is coconut husk substrate. I've used it for years and it's easily my favorite. But I live in the desert where other substrates made keeping humidity up too difficult in glass enclosures (I like seeing my animals and creating really pretty enclosures) and I didn't like things like cypress mulch because I didn't like the feel of it (almost splintery). Now that I have a proline I could probably use other substrates without humidity being an issue, but I really like the look and feel of the coconut husk. The only issue I have had with it is that some batches of it have had little bugs in it when it's rehydrated. They aren't harmful to the snake at all, they feed on plant matter, but I don't like having them around. So now I store the substrate in the freezer, and then bake it in the oven before putting it in her cage and it's worked great, never had any bug issues since.
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