Hi can anyone help please. Temp and humidity are spot on and at day 20 3 chicks hatched. I had trouble walking as one foot is bigger than other: 2 more pipped 15 hours ago and I had a massive hole with no membrane showing but has been like that for 9 hours. The other one has a smaller hole but the membrane seems to be growing yellow. They are moving slightly but seem unable to hatch. Help??