First time hatching in an incubator. I have a Hovabator 1632 and everything seems to be going great, have had no temperature issues, humidity is good. I set 40 eggs, mostly Marans, Welsummer or Olive Eggers, though there are a couple light brown eggs. Today was the 6th day and I thought I'd candle.. . I bought a small flashlight with 230 lumens, and I can't see a darn thing in anything but the light brown eggs. One of those 2 definitely has a developing embryo. I have 3 roosters to probably 40 hens, so I know that my fertility might be low..but I can't believe that almost all of them could be infertile. Anyone have any helpful hints on how to candle dark eggs? Thanks in advance!