I put 14 eggs into the incubator. 4 still look good on day 7. 6 have a blood ring and 4 were completely clear. Of the 6, 5 were of 1 breed. I am scrupulous about cleaning the incubator after a hatch and then again before hatching. Doesn't 6 red rings of death sound like a lot? Any ideas why? Should I shut down the 'bator, sterilize and put the good eggs back in?