I agree with Deborah, I keep my snakes in naturalistic setups in aquariums and this is something that some keepers really frown upon, the same people who think it's a death sentence to keep lizards on anything but paper towels.
I don't want to make it sound like I'm accusing you of this, but It would come off better if you at least had some photos of examples of acceptable setups. If anything I'd give the discount for a picture of a thermostat. If they have one of those then it's likely they have done their research into whichever "style" of setup they want and can keep a ball python alive.
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