I have 19 Silver Cuckoo Marans eggs in the bator on day 12. All appear to be growing as they should. Temp is holding between 99 and 100 degrees and the humidity fluctuates between 30 and 45 percent. Am turning 3 times each day. I get kinda tickled when I read about some people getting all nervous and worried about their eggs. Of course i want all my eggs to do well because we like eggs for breakfast, but I only paid $2 for the whole lot so if I lost em all I'm only out a couple bucks and a little time. Plus, I'm gaining some knowledge and experience. That alone is worth the price. So, no worries. My advice to everyone who is hatching eggs is to just relax because chickens are making eggs every day.