Well....
it really depends....cause if you are really just thinking of breeding, that height is already good enough.
I know that a lot of breeders use around that height of a tub.
I personally use Sterilite boxes which are 231/4 x 17 x 6 inches (deepth x width x height)
If you want a very healthy and good to display kind of snake, then yes a bigger tank is needed.
Otherwise, those are already good enough for them for their whole life....
Hope this helped...
Good Luck and Happy Herping!