all of them have obvious blood rings with the exception of R1. For R1, it doesn't look like any shape a viable embryo should be having.I went are looked at the pics I posted in initial post. If what your saying about the R’s is correct than I am quite curious as to why
I'm guessing R1 is around day 5....
For reference, if you look at this video (just scroll through to the candling part), you can see that a viable embryo has nice strong veining branching out from a fairly active bean shaped embryo in the center.
Sometimes the eggs are hard to see when candled due to having dark shells. And viable eggs might appear to just be a shadow with no obvious veins. However, since your eggs are fairly light shelled, veining should be easy to see.
Here's a video of one of my own eggs on day 7
you should be able to see the embryo move. I've had some quieter embryos, but unless chilled, they will show some kind of rhythmic movement.
this is also a great video to show the inside of a developing egg

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