I built it myself from a Rubbermaid cooler following directions that I saw on BYC. I finally got the temp. at 99.7 but the humidity is at 65% which I thought was too high for new eggs. I have a fan to circulate air. I removed the water in the tub and I have both air tubes open. Do I need to make more air tubes to lower humidity or what? There are no eggs in it yet I'm still trying to get it regulated. But, I'm getting frustrated.