I have raised Cortunix Quail before on a very small scale. I recently obtained a dozen eggs and incubated them successfully in my Brower Incubator. I raised them and now they are producing eggs regularly. I collected the eggs over several days and set about 50 eggs. I use a calibrated digital thermometer exaactly like the one I use in my lab at work. The water pan under the eggs is always filled with warm water for humitity. The chicks hatched perfectly but a few days after hatching they started laying on their back and couldn't get their legs under them. I switched brooders and I use is a heated plastic Rubbermade tub with soft toweling for them to secure footing. I have even left a few in a spare incubator to see if the grated bottom would help, but the same thing happens. Again, they are healthy and running around eating and drinking for a few days and then their legs get stiff and they cannot get up off their backs. Any suggestions?