really large air cell

[betta_1]

As you know i have 6 Duck eggs in the incubator atm, they were posted.
Day 6 now, still no viens, but there is slight movement inside the eggs from something.

Im slightly worried about the air cell, its large, larger than when i recieved them. Does anyone know what this is?

 

[Germaine_11.20]

The egg is supposed to lose moisture as it incubates. If it doesn't lose enough, when the chick pips to hatch out the excess fluid will drown it.
Too much loss and it may shrink wrap. It could be a very porous egg. They lose more moisture. There isn't much you can do about it without hurting the other eggs if they are developing normally.
If you had another incubator you could put it in there and keep the humidity a little higher than average so as to slow down the evaporation.

 

[betta_1]

ok, so is the humidity too high or too low, its at 45-50% atm.
Sorry, im confused

They are all like that.