Thanks, The photos were taken through the top of the incubator - it's one of the 'full view' hovabators. I love that machine! Regarding candling the dark eggs, what I use is one of those 1,000,000 candle power flashlights. I took a plastic flower pot/hanging basket, cut a hole in the bottom and lined the hole with electrical tape. This helps cushion and seal around the egg. The light will get hot prety quickly but you can candle for about 5-10 seconds without a problem. This gives you ample time to see what is going on inside. You still don't get a lot of detail but you can see blood vessels at about 7 days and monitoring the air cell is easy. I will try to get a photo of the light assembly and post it to make it a bit easier to understand.
Richard