I don't understand it! I haven't been really counting how many hatches have been failures, but I think it's been around 5. I can get them to develop until about day 16 pretty well, but after that they start dying one by one. I changed to less humidity during incubation and more ventilation, more sterilization of the incubator and my hands before handling them. I've been opening up the eggs after they die to see the condition of the chick inside. This last one seemed promising since on day 17 one of the dead chicks had almost completely absorbed its yolk and had no stink or green. Today when day 21 had come and gone with no pips, I decided to candle. The remaining 5 were dead. This time with green in the liquid. I don't understand why there is liquid since the humidity has been low (except of course for the last 3 days). It's like they poop when they die. Or they poop because they are distressed and then they die. The ones that managed to live before usually had green liquid and had major goo that quickly turned to crust. I thought the humidity had been too high during most of incubation so they had the goop. I haven't opened the last 4 eggs, but they are dead. I can see poop floating around inside the liquid in the egg and no spontaneous movement. WHY is there liquid inside the egg?! Humidity has been 30% to 40%, about a third of the egg is empty from evaporation. Everything is right, but they die. I didn't have the humidity gauge in there this time, but I know it was plenty high, probably around 70%. I don't feed my chickens bad food. There aren't any mystery weeds that they could be eating. Any ideas could be helpful.