yes the egg is rotten, i would reach in there and take it out really quick but make sure that you have warm water to put in the bator so that the humity dosent drop for the other eggs about to hatch
I grab a plastic shopping back, stick my hand in it, and reach in and grab the egg. When I pull my hand out, I tug the bag down off my hand and around the egg. Just like using bags to pick up anything yucky.