He said balls in a previous post which is wrong. Not saying that some balls won't enjoy some space to climb but they don't need it. They need 2 properly sized hides and do just fine in tubs. As I already said for boas, get a boaphile type cage for it. Again, do NOT use glass tanks for big constrictors as they can just smash out. That is what happened with the Burm that killed the little girl in Florida. It was an 8 ft animal which is boa size.