I candle chicken eggs at 7 days. For muscovy since the incubation time is longer I would wait a few days more to candle. Probably at 7 days.
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Rocks are an interesting idea, if they did not overheat them.Could you heat rocks by a fire and use there warmth as well? I love the compost idea. Warm bottles of water and use to heat box and nesting materials? Can you wrap box in something to create layers to trap air in-between like you would to stay warm in winter while leaving a way for fresh air to get in? Solar oven style incubator lined with rocks to hold heat at night? Green vegetation gives of mositure and some heat while it rots. How small is the box and how committed are you. The human body genarates alot of heat...armpits and we'll...
It's your choice to candle as often as you want to. Some people candle every day! I just don't because I don't want to open the incubator too much, and time. When I was new to incubating, I did candle more often.Sorry @JanetMarie, my patience blew up like a bomb and i candled the egg.... Voila! An embryo has been developing.. I just don't understand why the other egg has a larger embryo than the other one......