What are you using for your heat source, and how are you getting your temps/humidity? Are your probes in a place that accurately read the temp of the bottom of the tub? I melted small holes in the bottom corners of my tub so that I could barely squeeze the probes through, and then I tape the probe right to the bottom of the tub on the inside. This way, I don't have to open the tub to see the temps, the main units are sitting in front of it. Just my