Thank you for explaining which side had the air cell, wasn't sure what peeps meant when they said that. So another question, if i set the eggs last Sunday that would make tomorrow, Sunday day 8, assuming you count the set day as day 1 correct? if so, i will candle tomorrow and then leave it alone. I do have two dark brown eggs in there so probably wont be able to see anything so may have to candle one more time before lockdown. I think I read somewhere if you leave a dud egg in there the entire time it could break and stink up the incubator and be bad for the developing chicks. Is this true?