So I had put 10 barred rock(rooster) by Rhode Island Red(hen) eggs in my incubator. All 10 were fertile but at day 10 one had quit, day 15 one had quit. So I’m down to 8 eggs. Tomorrow is day 18, 4 eggs have great looking air cells and the other 4 have air cells that look a little too small, like they would look at day 14. What should I do? I’ve been doing a dry hatch I haven’t added any water. My humidity has been 25-35%. Last week it was very hot for 3 days in a row and my humidity went up to 40% on those days, don’t know if that’s what caused this. If I add a bit of rice to the incubator would that help or would that dry out the 4 eggs with the good size air cells?