I'm on day 22 (will start day 23 in 1 and 1/2 hours) and we were just getting ready to go to bed so I was checking the temp and humidity and turning and spraying... I noticed 1 of the eggs had like a crack in it. But it was more of and inside crack, (kind of hard to explain) - so I candled the egg and the baby is moving around in there but he crack is NOT in the air cell. I candled the eggs last night and that crack definately was not there. We've been busy so no one at all has been near the incubator so it didn't get bumped...... Its definately a crack made from the inside. When you run your finger over the crack, its smooth, but its a good enough crack you can definately see...................... So my concern is that it isn't in the air cell, will the duck be ok if it tries to get out while we sleep? Also should I consider going into lock down early and up the humidity? I quickly checked the other eggs (but not candled them) and didn't see any visual cracks like this one...... What should I do?