Well last year I had two hatches of 20 and both were completely unsuccessful. After they died I cracked the eggs open and it looked like they had been on maybe day 19 or 20. So what did I do wrong? Someone told me that I needed more air circulation, but how do you guys promote air flow in your bators? I had a fan and I had 5 cork sized holes for throughout the incubation. And then some said the himidity and temperature. But they looked like they were fine until they didn't hatch. I am so confused!!