The first time I incubated eggs I had a really hard time seeing movement and the chicks were fine. I don't know how experienced you are in hatching so it is hard to tell if your chicks are fine. I do not have a lot of experience hatching but I did get better at candling each time I hatched. I would say leave them all in for lockdown, as long as none of them smell, and see what happens. It certainly doesn't hurt to leave them in. Good luck on your hatch!
Yes, I think that is pretty normal. At that point, the entire egg is pretty much filled up, but the chick hasn't yet punched through the inner membrane into the air cell. Its pretty hard to see much of anything going on. If its almost all dark in there and the air cell is getting bigger, things should be right on track.
Yep, I just looked at mine(day 18) and the egg is so dark/full. Them babies fill it up and fast. I seen quite a difference in just 24 hours. I am on day 20.
