Hey congrats on your new pet! Ball pythons are the best, especially when they are little worms like yoursthe setup you bought sounds good, it's just a matter of using it correctly. A baby bp can happily grow up in a 40 gal, so long as you clutter it and give him a ton of hiding spots. I personally prefer heat lamps over heat mats. They distribute the heat more and are a lot less faulty!! It's completely normal for your bp to refuse food after only 3 days. Give him a week to settle in, these guys don't handle change too well. As for feeding size, aim for a rat or mouse the same thickness as the thickest part of his girth. No bigger. I know someone said don't go any smaller than a hopper, but this is entirely untrue. My guy had to start on mouse fuzzies, that's how tiny he was! I tried going bigger too soon, and he couldn't handle it. Regurgitated rodents are not something you want to deal with!
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