I decided to try and hatch some of my own duck eggs. They are Black Swedish, Welsh, and Runner crosses. At day 4 out of 19 I had 7-8 that had strong babies. I candled tonight which would be day 8 and all but 1 died. Any ideas on why? According to my temp guage, the temp was around 99, never above 100 and the humidity was at 60-70. I had read that is how high humidity needs to be. The ducks are young, not even 1 year. Could they be to young to have strong babies? Thanks for any help. Don't want to go through this again. It is kind of sad.