I set a mix of 20 eggs 10 days ago and candled them on day 7 with my iphone and an LED flashlite. I have a mix of Black Copper Marans, Olive Eggers and Welsumer eggs. I know, great combination to do first time out. It is really difficult to see into those dark eggs? So, I built a 10" x 10" box and wired up a 150 watt bulb inside. Then had another look tonite. This helped but I still have some questions. If the egg looks "runny" or "watery" it is bad ...right? From what I have read a bad egg is "clear". I can kind of make out a yolk but the inside moves about freely as I rotate the egg over the light hole. So, I should cull those 2 eggs? How long do I have before a bad egg explodes? They don't smell rotten, should I be able to sniff out a bad one on day 10? On the lighter eggs, I can see wonderful development and vein formation. This is so cool!! Please help. Thanks