My guinea hen as been sitting on 20 eggs for awhile now and today she flew off the nest with an egg in her mouth. When my wife went to check it out there was a chick hanging out of the egg and pecked all over the head. She took the remaining eggs and put them in the incubator. I just candled the last 19 and 18 having moving chicks in them with large air sack like shown for 18 days. I have my temp set at 99.5 and trying to maintain 75% humidity until they hatch. I am considering this as lockdown time. Is this correct and does anybody have any suggestions, because I would hate to have 18 good eggs and none hatch because I did something wrong. Please any help would be greatly appreciated. Thank you all for a great website and for your help.