I'm not new to hatching but recently the girls have been laying very round eggs and when I set them in the 'bator this morning, I couldn't tell which end was which! I tried to candle but couldn't see anything; was hoping to tell which end the aircell was at. I set them in the racks the best I could, but I'm thinking I'll candle in a few days and see if I can tell then and flip them if necessary? Thoughts?