I am about to add water to the incubator and I thought it would be exciting to see whats going on in the eggs one last time before I close her up for the next 3 days. Would opening and closing the bator to do a candling of 25 eggs be harmful at this point? Update! I decided not to candle, after I thought about what Cyn had said. It made me nervous. I got all the eggs out and removed the turner. As I was placing them back in , I heard peeping! Is it too soon to hear peeping at day 18? Could they come early?