That view just shared is why we were all sorts of in the bator during the hatch. A few posters shared as much. We figured the hen isn't doing rocket science so as long as we weren't just leaving it open we would be good. Had a great hatch. This time we even candled on day 4. Stay close to 100 and have modest humidity at the begining and higher towards the end was our final assessment of the process. It also starts with good eggs from healthy birds.