So today i candled all my duck eggs (I have 6 set). Starting the 23rd on... Well, ALL of the eggs are fertile. and i couldnt believe my eyes when i saw the LITTLE HEARTBEATS!! Oh my goodness. It was the sweetest little speck i have ever seen. I never thought or dreamed that i'd be holding an egg and see a heartbeat!!! wow. ok so that being said... when do i candle next? day 18? or when? only time i will open the bator is to flip the carton and to spray the eggs once a day. anything else?