I have 10 ducks-different breeds, different ages, in a tractor about 8x9 feet. Earlier in the summer, I had one khaki campbell that would everyday for 3 months. Never missed a day. Then, all of a sudden, no more eggs. We then moved her in with the others now. About half of the other ducks are "of age" to lay but won't lay! I don't know if the coop is too small or what. I feed them layer pellets at 16% protein (which worked fine for the khaki while she was laying). We just started putting a nesting box in to see if that would help (the khaki never needed one before). Any ideas, suggestions? We don't know what we're doing wrong!