Not happening. If I add humidity, the chicks end up in a wet, jelly-filled egg. With no added humidity, I'm having perfect hatches. I know what the science and experience tells you, but this is what's going on in my crazy incubator. Even if the chicks aren't drowned, they have a hard time getting out and they're too wet and they develop omphallitis or just don't do well. I am telling you the truth and I am not exxagerating, nor am I trying to get anyone else to do as I do. This is what's going on in my little styro world. I'm not having chicks get stuck in the eggs, in fact, I had one hatch with an egg that looked just like Kathy's the day before last. I have calibrated my hygrometer and so I know its not off by 50%. Of course, I am talking pre- internal pip. I can raise the humidity after they pip internally, but not before. But, of course, once they start pipping externally, the humidity goes up to around 50%. The humidity in my house is around 60%. Don't know if that makes a difference, but I thought I would add it.