I've read on the forums that 40% is best from chicken eggs and not to use 50% to 60%, as the chicks would drown in water in the egg shell when it goes to hatch and which has happen to my last two hatches. I on day 2 now, I've add some water to keep it at 40%, it went up to 45% than some hour later it droped back down to 40%. I've just check the humidity to night and it is up to 48% humanity. How did it get to 48%, I've haven't added any more water yet to my egg incubator ? My egg incubator has a fan. Do I need to get the humidity back down to 40% ?