from what i know & the ball python care sheet here, that 55 gallon aquarium is not a good cage for your bp.
i have a 30" x 12" x 12" that i will be using but will move up to a
36" x 19" x 18" later.
also aquariums dont typically make good cages for reptiles cuz theyre designed for fish.

i have 2 hides, one on the warm side & 1 on the cool side, so my snake will be able to thermoregulate (go from 1 side to the other to warm up/cool off).
i also have 2 water dishes, 1 on the warm side to hopefully create humidity & 1 on the cool side for drinking.
if you wanna get a smaller terrarium for your bp look at npicages.com.
im gonna get the 36" cage. it's a little over $100 bucks ea. but i think its a good buy.