99 percent of the time its low temps during incubationyesterday was day 21 with chicken eggs.
no pips.
destructive test was done on 4 of 30 eggs since I had difficulty understanding what I was seeing on the day 7 candle.
one of the four had a developing live chick.
went back and reread "Hatching 101"
question: What would be your next step in determining why the eggs go to day 23-25 to develop and hatch?