Well switching to a tub is a good idea if it is to benefit the snake. For example for those with major humidity problems, a tub is a good idea. But if you have the proper heat gradient, humidity and husbandry in a tank, then no you do not NEED to change it. I do not agree that people read a bunch of different books then make unnecessary changes, unless they are uneducated and use those books as their sole source of information.