I am testing an old round 845 incubator before ordering the eggs. So far, the temperature is proving very steady at 100*. I'm having more trouble with the humidity. I'M SHOOTING FOR 35-40% humidity for day 1-18. I have the little pan with about 1/4 " of water and two little sponges in the pan. I covered 4 of the 5 vent holes with tape because the humidity was staying in the 20% range. For an hour the humidity has hovered around 33%. I would be OK with that as I can add more water and bigger sponges. (This is my first time incubating, so I might be wrong here?) My question is: When you add eggs to the incubator, will the humidity level go up???? (after all, there is mostly water inside the egg to begin with and that needs to evaporate somewhere). I'm wondering what to do then, if the humidity goes significantly higher, do you take all the eggs out, take the screen out and dump out some water, etc?