future reference

When bp are full grown what size of terrarium should I be looking at?

A 40 gallon breeder aquarium is typically fine for adult ball pythons. There's a lot of clear surface area on an aquarium this size so think about blacking out the back/sides.

I would save up for a reptile made tank instead of a fish tank... you will thank yourself for it in the long run

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Minimum would be 16" wide x 36" long. However, bigger the better (so long as husbandry is maintained properly)