I just set some eggs I got in the mail under a broody bantam. I get OBSESSED with candling! Don't want to mess this up cause the mom once ate an egg when she felt threatened by another hen. I can tell if the eggs are firtle (sp?) but can't tell if I've lost one. What is the BEST of all days to candle that I'll see movement? Wanna leave it to as little as possible. Thanx!