Hermanns eggs

[johnathan9757]

Hi all me again, well after my terrible time with the incubator failing and teething problems with the new one my eggs are now on day 50/51. I candled them last night some of the eggs appear that the membrane is pulled down quite far others look like they have started to pull down and one or two are totally dark and don't look like the membrane has pulled down at all, just wondering if the membranes pull down at different times and rates even when the eggs have been incubating the same amount of time.