I am planning another addition to the cage, and I was thinking of using a tube as a ramp. My boys are still pretty young, and I don't want to have to increase the tube size if they outgrow it. Does anyone know what would be a safe diameter of tube that I should get for full grown males? The tube would be cut in half when it was inside the cage, but it will have to be whole when it extrudes through the top of one level before it connects to the next. I would like it to be clear (with stair tape for traction on the bottom) so that I can see the piggers at all times. does anyone know where I might find a clear tube like this? Have you ever seen one in a plumbing supply or building supply? Thanks in advance.