I had a great candling. It is the end of day 4 (counting setting day as 0). I saw actual embryos w veins and eyeballs in 10 eggs. The other 19 had various sizes of dark areas in them so they are all fertile. I have a bunch of different breeds in there so I have dark eggs and white ones. I dont know how big of a dark area is normal. There were a few with a really big dark area and some with smaller ones. At least I know that the 10 are cool. I am SO happy!