When i candled my duck eggs some of the embryos are in the center of the egg. Is this okay? There is air sack above and clearish space below. I can see veining but it is too difficult to tell at this stage if they are alive. It is very dense so nothing looks yellow-orange colored anymore. I am not sure if they are quitters and will cause harm to the others. I have to lock down tonight or tomorrow. I can try to take a pic if you want to see. Help?