I am incubating come R.I.R. eggs due to hatch 4/21. The incubator I am using ( L.G.) is styrofoam and borrowed. I really would not like eggs exploding in someone else's incubator. And in that styrofoam ~~~ ugh ~~~~~ what a mess. I candled the eggs yesterday but they are dark shelled and since I am a newbie I really don't know what I am (doing) looking at. If an egg is going to explode from bacteria at what stage does that usually happen ?? ("-") Thanks !