I'm incubating for the first time in my kindergarten classroom - the excitement is unbelievable, and is somehow adding to my stress about all of this! I have 7 eggs in a Brinsea mini advance. (Also 2 wrapped in a blanket that the kids thought would keep them warm, LOL). The woman I got the eggs from was unsure about fertility (but they were free, just the right price!), so I have 2 separate concerns. First, aircell size - I'd say on day 6 it's about as big around as a quarter. Does that seem about right? It's been quite dry in my classroom (usually around 28%); I've followed the instructions and kept water in one of the wells. I don't have a hydrometer that fits in the incubator with the eggs, but one well full had it at 39% before I added them. Second, I've never candled before today. My light isn't very good, so I didn't see much, but on the 3 lighter eggs, I can see a shadow over about 1/2 the egg, vertically. It's definitely there, when I turn the egg it stays in the same spot. Our eggs we are incubating in the blanket look lighter and more consistent all over, so I'm assuming that means the warm ones are growing? Or am I way off on interpreting what I'm seeing? I'm not seeing any definite veining or singular dark spots, just a general shadow. Not looking to spend any more to get a better candler right now, so I'm just trying to go with what I've got - new batteries in it, though Thanks it advance for the help!