Hi - i have another post here about my trials and tribulations of a late first hatch. But i have a new concern. When i look in the incubator with a flashlight, i see some yellow yolk looking stuff on one of the eggs, like it has perspired it on top of the egg surface. Does this mean it's a rotten egg and should i remove it? i'm starting to smell a bit of funkiness coming from the vent holes. Would appreciate advice (quickly, in case it decides to explode on me) Thanks.