Had a miserable hatch rate on my first hatch, so I'm about to set another batch and was giving them one last inspection. As I set the eggs aside this week, I candled to verify there was an intact air cell at the top. This was usually the case, a small but identifiable air cell. Now, prior to setting, eggs only a few days old don't appear to have one. Is this a concern prior to setting them? I quickly go from having 40+ to set to only a 18 or so if it is. My house is a little on the dry side being winter, but on the very cool side... 56-66F depending on time of day. Eggs were rotated and stored with the wide end up.