Hi David,
I’m a first timer. My first brood produced 4 eggs. Only one hatched and is doing fine. I removed the unhatched 3 at day 22. Two of them were duds with no fetus, and one actually had a fully formed fetus. It must have died during incubation. 75% failure rate. I’m pretty sad about that. Maybe my pair will try again after my sole survivor fledges around May 15.