I found lice on one of my seven hens this afternoon. Many are showing signs of feather loss. Has anyone used DE to treat it? I bought the food safe one. How successful is it? How often do you need to apply it? I plan to dust all of them and put out some free choice for dust bathing in the coop. I did a full clean of the coop on Wednesday. Shoveled out all the droppings, and lots of new bedding. Do I need to do that again for safe measures now that I am treating them? This is my first experience with lice, and I'm feeling a bit defeated at the moment. Thanks.