I will try to be brief in my story telling. I incubated 90 eggs from a local hatchery and only about 20 hatched and only 16 lived pasted a week old. I was pretty discouraged having hatched plenty (over 150) of my own eggs with 60 to 90 % hatch rates. So i posted and found out my humidity was too high too long. So I corrected teh humidity and threw 26 of my eggs in the incubator and 18 ended up being fertile and of the 18, 16 hatched (one oriented backwards and another pipped at the bottom of the shell and died.) all 16 are still alive. So out of pride to show that i can hatch chicks. I purchased 120 more eggs, candeled them, ate the cracked eggs and ended up with 112 in the incubator. Of the 112 about 75 to 80 developed normally. I put the eggs on lock down and on day 20 eggs started pipping. By the end of day 21 I had 30 fully hatched chicks and not a single other egg pipped. So i candeled them again and saw almost no movement. So i started doing eggtopsies on them. of the remaining 45 to 50 eggs only two chicks were still alive. only 3 had broken into the aircell, and the rest were dead mostly grown and most without absorbing the yolk sac. so I would say they died between day 17 and 20. I have read the hatching 101 post a dozen times and love it. But i cant figure out what I did wrong. I kept the humidity between 20 and 30% as suggested i turned the eggs at least twice a day. I have three fans to circulate air ( two of which slowed down near the end but never stopped working.). I built this incubator out of an old mini fridge and my air holes are 8 1/4 inch holes i drilled in. one right behind the fan for ventilation. So why did i get such a poor hatch? is there a reason that so many died after developing? I am open to any suggestions or comments. In addition, of the 120 eggs 60 were EE eggs. Only 5 hatched, I got 60 brown egg layer mixes and of them i got 25 chicks. all the eggs were mixed and alternated throughout the incubator. Could it be bad eggs. he said they were fresh, gathered the day before I bought them. Give me some love BYC experts!