I recently tried to incubate 50 coturnix quail eggs and had only 4 hatch that survived and two that hatched and died within hours. I broke the remaining eggs open and saw that three eggs had embryos developing and the rest had nothing developing. Also of the eggs that hatched they did not start hatching until 21 days after I started incubating. My question is was the temperature to low or was the batch of eggs not good or a combination of both? I maintained the temperature between 99 and 100, but the thermometer could have been wrong. Any help would be greatly appreciated.