I gave up. My incubation situation is less than ideal; I lost all the eggs I already had in the 'bator. =(
I'm getting a proper incubator next month, so I'll be ready to go for an October hatch. =)
Yes, it sounds like your top yolk is fertilized and the bottom one is "a clear". I'm not...
I just set a super giant egg from one of my sexlinks. I'll candle on Wed when I candle for lockdown for the eggs that I had in there already.
I'll try to keep posting.