I'm guessing the other egg is dead. I believe it was the first to pip and it has been about 40 hours now with no progress. The one that hatched is doing great.
Our first incubator died on day 20 and we had only one chicken hatch. She is now a house chicken. We don't notice the dander from just one chicken but I would recommend diapers!
I've never seen a wild bird nest with supplemental heat. If you add heat and for some reason your power goes out your chickens will die. Don't get them acclimated to a false climate.
Not to continue off subject but if you use the ice water or boiling water described in this link you have calibrated your thermometer for those temperatures. 100 degrees is almost in the middle of those temperatures and thermometers can be way off even if they are calibrated using those methods...
There's a thread somewhere that tells you how to calibrate your incubator temperature. I don't know where it is but basically you just take modeling clay (I used silly putty). Put it in your incubator for about 8 hours or more then take an under the tongue thermometer you can buy at Walmart for...
I'm in! I've got 2 incubators now. One is running with 10 bantam cochin/silkie mix eggs due on the 21st and I plan to add more later on the 11th. I will run the second incubator as a hatcher and really get myself into trouble.