An adult can do well in a 30-40 gal breeder. It is longer which is what they need. I have 4 right now. Really I have a 6 month male and 4 month female. I have two 2 month hatchlings that are my gf's birthday present. This is what I suggest for anyone getting a BD.

Juvie-Adult
30 gal breeder
160 watt Mercury vapor bulb (Trex UV heat)
adjustable stand for light
a log (basking)
some type of slate rock under the log for shade and dulling nails
a large cricket keeper
Jurassic Calcium powder and vitamin powder.
A spray bottle for misting
food bowl
temp gun/probe

They are super nice. I put them on their leashes and put them on my shoulders and walk up and down the boardwalk with them. Everyone handles them and they love it. I wish you the best on your BD purchase. If you have any questions let me know.