a small crack in this egg on day 20 turned into an almost completely disintegrated shell by day 21. I have had eggs crack before and tried to seal them but they have all failed to hatch so I left this one alone and now I am regretting that. The chick in this egg is still alive and has internally pipped. I believe it is trying to unzip. I think main concern is keeping it moist enough to prevent shrink wrapping - any ideas on how to best do this? Should I apply any oil? Any other tips or ideas? Should I keep it under the broody mom or start heating up my incubator to finish hatch? Thanks all! !!