What substrate should I use?

I use aspen for my bp but I use tubs. When he was in a glass tank, I used coco fiber with moss. However I live in FL so the average level humidity in my home don't fall below 40-50% anyway. You will have to try what works for you.

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Not sure if this will work or not, but here you go OP!

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Where I live it's very humid in the summer and then lower in the winter, and so I'll do a mix that will hold less humidity in the summer ( because of high humidity) and then a mix that'll hold more humidity in the winter...
Sound alright?

I've used aspen, Reptichips, Eco Earth, and cypress for my BP as well as my other snakes. Used Reptile Prime for my GTP. All of them worked fine to an extent but some had more flaws than others. My advice is get a bag or block of different stuff during each change until you find the stuff that works best for you. Everyone is going to have an opinion or what THEY love. Doesnt mean its the best stuff or not. Substrate choice is a very hot topic that a lot of people seem to get passionate about on this board lol.

Imo, the best for me is Zoo Med Forest Floor cypress. Decent price, lays flat so snakes cant bury poops or pisses, kills odor, is naturally mold resistant(which makes sense....cypress forests being fairly wet places lol) and is big enough pieces that it doesnt really stick to prey unless the prey is dripping wet. Plus it holds water well and releases it more slowly like ReptiChips so you dont need to constantly mist the substrate.