As I'm sure this is normal, I have yet to figure out how to combat it! The humidity in my bator spikes dramatically as eggs hatch. Both red stoppers are out and humidity is steady at 65% but it jumps about 5% per egg that hatches until I remove the shells and crack the bator to let it air out. The view window will be covered in condensation as well so I dry it off with a papertowel. So far this is all I have figured out to do to keep the humidity as close to 65% consistently. Any better methods? Can't control when those little buggers pop out and I'm not always there to monitor the humidity when they do decide to make their debut.