To add to what I've already said, a higher humidity is not all that bad either, provide you keep the temps in the desired range. In they wild in Africa, they are used to the humidity going up to 95% Its just that when you have them in a captive enclosure, it increases the chances of bacteria developing over time. So if you spot clean your cage and change your substrate everyday, chances are that he will live a long healty life without an RI.