When I first set up my Vivarium the humidity was stable at 80%ish, however the past few weeks it has dropped down to 60%. The Exo Terra Digital Thermo-Hygrometer combo has been positioned in the same place since I got it and I literally have no idea why it is dropping so much?
Here is a video of my set-up: https://www.youtube.com/watch?v=A5hwPV9uGi4
Any help would be appreciated.