We candled the eggs up to 3 days before hatching and noticed movement, but the next day we candled we did not notice any movement at all. We let it go until a day after it was supposed to hatch then opened it. The embryo was dead. It was fully formed but had not absorb the yolk sack. The membrane appeared to be dry, but I am not sure if it was because it had died. But it never attempted to pip the eggs or anything else. What could have caused this? We have four more set to hatch in the next 2 days and would hate to lose them. Also the day before they hatch the air cell seems to get very large, bigger than any other time we candled.