This is my first attempt at hatching. I candled them this weekend. For majority of them, I could see the air sack on rounded end, it was black in the middle, and I could see light on the bottom 1/4 of pointed end. Is this what I should be seeing at this time? I had a few that I could see only a ring. I threw those out. I've looked at tons of pictures, and I think this is a good sign.