My incubator is a Pro Series Circulated Air Incubator with an automatic egg turner... I'm new to this and my incubator has two red plugs that pop out to allow more air flow. The instructions say only take then out at time of hatching... but if I leave them in all this time, before hatching, how will the eggs get enough oxygen?? Won't they suffocate? How do you all make sure your eggs get enough air?? Thank you!