3. Humidity: Unless the enclosure is kept in a humid reptile room or outdoors in the deep south, there is no way you have 50% humidity in there.
That was the first thing I thought - although having a damp layer underneath helps a little with the humidity, especially at ground level, I can't imagine it's more than 25% in the open area . Also, speaking of open, there isn't nearly enough cover for them to hide under either aside from the closed part. That will not only help them feel more secure but also help create more small areas of humidity.