DH has now tried three clutches.... has lots of eggs make it to lockdown day, and then we lose them all.
We started some on 6/9 and all were gone around day 19, we think. He candled on day 23 and they had barely changed at all from when he put them in the hatcher. Same thing with another round from 6/11. This week, we put in one lone surviving egg from 6/16 - yesterday, on Day 20 the egg was rocking. Now, Day 21 and we've seen no movement or change all day.
He's been watching the temp and humidity and there are no major fluctuations. Nothing to disturb the incubator. What is he doing wrong?

He's been watching the temp and humidity and there are no major fluctuations. Nothing to disturb the incubator. What is he doing wrong?