Put 40 eggs in my "new" Hovabator (used once before) 7 days ago... just candled them, some are clear (expected) and some look like early death. None look like they are alive. I am new to this... looks like veining near the air sack, but the yolk is all slush and moves around. Any ideas what causes this? Wondering what I should change next time? My humidity has been around 40% - factory temp settings. Digital display says 99.6 -- thermometer inside says just under 99.5. Auto turner being used. Thanks!