again today, got up and tube was clear but by 10.30 only 1 1/2 hr after son had left and the little fella had blocked the tube again??? it must be hard work for him as he has to get sawdust and some bedding from all over the lower section to fill i would estimate a good foot worth of tubing

have unblocked it again and re-arranged the cage so the tube is flatter rather than like a big drop and we will see how he handles this