So we had an excellent hatch so far 29/30 eggs the one still looks good hoping it may be a late bloomer. The issue is my wife kept putting eggs in even after she gathered the original 30, ( 10 extra stacked) It was her first time using the incubator. They all seem to be at different levels of development. So I moved them to a second incubator and turner. I think I already know the answer to this question as I have candled and been trying to figure out where they may be in development. Other than comparing to pictures on stages of development from google anything else I can do to determine when to move them to the hatcher?