When I incubated I took chicks out as they fluffed up with no problems with the others in the shells drying out but I would not advise anybody else to do that. Our relative humidity is always high. I've had more problems with chicks growing too big to zip more than anything else and that's with no water till the 18th day. Talking Styrofoam incubators too. Since I did it so much I perfected timing and peeling them leaning over the sink with warm water running and tweasers
I was just talking broody hens yesterday
I never had any of those fancy incubators
I knew you were talking broody hens. I only put eggs I know 100% I will be able to tell apart otherwise it's just one breed, preferably.