So I received both eggs and a homemade incubator from a friend after she successfully hatched to Rhode Island Reds. Was in the incubator were five more Rhode Island red eggs one Leghorn egg and now one of my duck eggs. Honestly I don't expect anything the hatch, my friend didn't really know how many days they have been in there only that the two had hatched. So I tried candling the eggs to see if they're worth continuing in the incubator but honestly I don't know what I'm looking for. I looked on YouTube and found a couple videos of eggs that had spider webs and small spots and then that would indicates a fertilized egg. All the eggs that I got are dark throughout with only a small pocket on one end of the egg. I see a lot of different temperatures and humidity throughout the post so I'm not sure where it's supposed to be, my friend had been keeping the homemade incubator at 104 degrees and around 50% humidity. That obviously works for the two that already hatched, but I have no idea if it will continue to work for the other eggs. Can I assume safely that all the eggs because I can't see through them have chicks living in them or are they all dark because there's nothing living in them. Thoughts?