I'v got a question - if opening your incubator after lock down can have such disastrous effects on your eggs, then why are there all these videos on you tube with people opening theirs to show their chicks in the middle of hatching? They don't seem to care and are leaving the lid off for a considerable amount of time while they chat away to the camera.
Yep i've seen in and they are risking their hatch. It is amazing how quick it can happen,