air cell incubating eggs are a little small for 9 days.

If you feel your air cells are too small then the humidity could be too high. In order for your air cells to grow adequately your eggs need to loose enough moisture. Eggs lose moisture through their shells and the rate of evaporation depends on humidity levels around the eggs. Short term variations in humidity are not important. The average over the incubation period needs to be near optimum to achieve the ideal weight loss. I would try to lower your your humidity I hatch at 45% for day 1-18 then 65% for lockdown. With only being on day 9 this should not be problem as long as you lower it if it is too high. There are some good pictures in the learning centre on candling eggs. Hope this helps and wishing you the very best of luck with your eggs

 

To lower humidity you need to remove water from your incubator. It's surface area of water that creates the humidity and not depth of water in pots. I would start with a small amount of water in one pot let that settle for an hour to get a reading from your hygrometer then if you need to add more only do it a small amount at a time. You really don't need as much as you think to create humidity. Hope this helps and good luck

 

If your air cells are much bigger and near what they should be they should be fine and able to hatch ok. The chick should know what to do. Try not to worry and good luck