Hello! Homeschooling animal loving 4H family, halfway through the first hatch. We had a broody hatch last year and it was great, but the kids want to start raising different show birds. We have a Farm Intovators 4250, circulated air and egg turner. Today we candled the eggs(only one dead out of the fertile eggs!) the eggs closest to the heater seem to be a little farther along in the growth process. Should I be concerned? I don't want to kill any, 29 alive and moving.