I have had a Dutch bantam chick hatch on day 17 before.
My total for hatching is 8 of 9 eggs. I mis-spoke earlier when I said I had 10, its only nine. 5 blue silkies and 3 other silkies.
I have 6 out of 10 eggs hatched and 3 zipped and almost out.
Three silverish chicks, 2 blues and a black.
Here are a blue and two mystery silver colored birds.
When I had a styrofoam incubator I used to put the eggs in a egg carton to hatch as well. It seemed when they were up and down in the turner and I changed their direction by laying them on their side, it messed up their sense of direction. By hatching in a carton they were unchanged in position...