Two incubator hatches in a row with less than 1/3 success, WHY? I have had two incubator hatches in a row with less than 1/3 success. I am using the octagon 24 Advanced EX. I bought the eggs from two reputable sellers on BYC. One set was cochins the other duff orpingtons. The first set I didnt candle or touch at all. The second set I candled before lockdown. Five of the 27 eggs in the second set had not developed at all the other 22 had a clear air sac. I tired humidity at 50/60 and 55/65 the temperature a steady at 99.6 (edit corrected I use 99.6). The eggs in the second hatch were laid on their sides. Can anyone tell me why Ive had such poor hatches?