Hi All, I have 12 copper maran hen eggs now at day 19 (Fri 27th), stopped turning and set in the Brinsea hatchmaker, hatcher incubator. My concern is that some of the air cells are small, some look bigger and more normal for this stage of incubation. They had been set in brinsea octagon eco for the first 18 days. The eggs are quite thick shelled and am wondering if they have not been able to lose enough water. Three out of 15 eggs were infertile, as far as I know the rest are still moving. There is no external pips as yet. Incubator has been run at about 37.5c and the hatcher is 39c. Humidity in hatcher is about 60% now. I'm just wondering if I should have ran incubator drier, I just topped water up every 2 days. the average humidity was about 37% during first 18 days. These eggs are being done for someone else, so I want to get it right. Any advice or help would be great. Thanks Lorna.