I candle frequently. I had eggs in the hatcher on day 21 and I also have some eggs(ran out of room in the other bator) that needed to be turned. I just add some hot steamy water to bring the humidity up after I turn, been working fine. On a whim I decided to candle one of the eggs on day 21 since I had no pips. It was dark (blue egg), couldn't see air cell or anything. Thought I might have just missed a bad egg when I decided to candle the small end. There was the air sac? The breeder marked the egg on the other end, I marked it on the other end AND in all my candlings didn't catch it, I don't know how. I have done this early on in incubating but never had any make it to the hatcher upside down. Since I hatch in cartons I decided to just lay it down in case it oriented itself upside down. that it hatches anyone have success hatching an egg that was upside down the WHOLE time?