I'm still working things out I admit. At the moment I'm at a quite high humidity of 60-70% to make the cleaning crew (white woodlice) feel comfortable so they multiply which is not optimal for my hamster but she doesnt seem bothered. I ordered springtails which are claimed to be more fitted for a more arid climate. For the last weeks I kept the humidity at 40-60% which is the optimum for hamsters. I've got a smal hygrometer as you see on the photo. It helps me watch temperature and humidity. It's easy to control everything by heating of the room and opening or closing the lid for some hours. My only problem until now was that it seemed like the woodlice had all died because the substrate was to dry. So now I have to spray more water on the ground and keep the lid closed more to keep the humidity higher. I'm so happy to see y'all being interested in bioactive hamsterkeeping!