I have set 26 eggs, 20 of which I can see are developing just fine. The remaining 6 (these were part of the shipped batch) have shells that are too dark, or "splotchy" (the shells are splotchy) looking when candled, so it is nearly impossible to see if they are developing as well. One of these 6 has a black spot floating around inside the egg at the bottom. The eggs are set upright in a carton that has a pvc pipe glued to the bottom so it tilts the eggs back and forth, instead of the eggs laying on their sides and me turning them. I had heard that for shipped eggs, it was better to have them upright in case air cells got moved around. But, any idea what it means that there is a black spot floating around inside the egg at the bottom?? We are starting on day 6 btw.