Oh yes, forgot about that detail. Learned that the hard way. Next year I'm buying a separate hatcher for staggered incubator hatches. May never use it, but don't want to go through this again.
My current incubator eggs were on days 11-14 of their incubation while I had earlier eggs hatching in the same incubator, so I raised the humidity to 65% for the hatch, assuming that I could bring the humidity down quite low afterwards to make up for it (which may or may not be true -- clearly I didn't preplan this properly). Well, we had a huge rainstorm plus nice temperatures right after the hatch, so the ambient humidity stayed around 70%, and the incubator couldn't get its humidity below 30-35%. So now I've got three eggs in the incubator on day 19 with air sacs a week behind normal, and the eggs have only lost 8% of their weight instead of the usual 11-13% by this time. The embryos are moving, but there's lots of water visible around the embryos. I've stopped the egg turner, and have set the eggs upright so that if a chick pips internally and keeps its mouth in the airsac, then hopefully the airsac won't flood and drown the chick. I've also left the humidity low to hopefully evaporate more water from the egg before it pips, and hope that the extra water in the egg will be enough lubrication to allow the chick to rotate and zip, even though the incubator humidity won't be as high as recommended for hatching. Does anyone have any other suggestions? I don't hold out much hope for these three chicks, as there's a lot of water visible in these eggs. I've thought of draining it with a needle and syringe, and it might work, but there's just too many things that could go wrong there. Has anyone ever tried that?
Sorry, not really broody thread topics.