2 different times now I have had almost ALL my duck eggs form but never hatch! The first time I had 2 of them Pip but quit, and I checked all the eggs BOTH times and had perfect formed ducklings but DEAD. Anyone know what causes this? and what I can do to prevent it? Getting another dozen of duck eggs this weekend and DONT want it to happen again Also another question, The duck eggs this time will be with chicken eggs, when I knock it up to 70% humidity will that bother duck eggs? What HUMIDITY do you use/thinks works best for duck eggs?