We are trying to hatch duck eggs for the first time. Not sure if we are doing the humidity correctly. I am confused about the difference in humidity and wet bulb. I think the dial I have on this incubator is percent humidity. Not sure. Last night I think it didint have enough water and the humidity went down - or maybe the wet bulb not sure. Did we kill them? We are at day 18 and all 9 had been looking perfect.