In my latest incubator with the most recent eggs in it, there is a BAD smell. How do I tell which egg it is??? When I candle, I can't tell ANYTHING. I haven't even tried with these eggs because I am scared one will explode. HOW DO I TELL???? Or do I just throw out the whole batch? Put one in water to see if it floats?? I can try to candle... but what does a rotten egg look like????