I dont put hides in every tub. For the racks I dont use hides at all if the sides and back of the rack are enclosed. As long as the snake in each tub is not too small for that size tub. I do use hides for some of the smaller snakes if they need to be in a larger tub. I also have a boaphile stacked cage set that has a couple larger balls in the 2ft by 2ft cages. These snakes get hides so they feel more secure.