So glad that I found this thread!! I have 40 eggs in the incubator and this is my first attempt at hatching. Today is Day 15 and I candled and noticed that the air sacs are small. The humidity has been high here so despite not adding water, my humidity has been on the high side. I added a bit of cat litter (didnt have any rice) and am going to leave it in until I can get the air sacs a bit bigger..hopefully I can get it done by lock-down but I most certainly have hope after reading this thread!!! I felt like I was reading something I wrote..I have eggs from my hens, eggs from my neighbors, eggs from the neighbors ducks, and then eggs that a local breeder gave me out of his 'rare mixed' pen that I got a few days after the first eggs were set but I didnt wait to risk loosing the eggs waiting , so I just added them as I got them.. heres to hoping for a lil of your luck