UGH, LICE can I add dust to sand?

Just found lice larve and eggs on my hens. Feather loss and decrease in egg production has been happening for a month, thought they were molting...so stupid of me.

Anyway I have a plan of action on the coop and dusting the birds. My question is:

I have a dog kennel with ten 4 week old chicks that are in my "clean area" of the coop. They do not come in contact with the other birds or the bedding. Do I need to treat them for lice as well? The nesting boxes, then a piece of cardboard seperate their cage from the rest of the birds.

Thanks for all the great posts on lice here. I am so totally grossed out!! BUT at least I know what to do.

 

Also, if I put some sand baths in my chickens play area, can I put some lice killer powder in it, or will they eat the sand and powder and get sick?

 

Thanks everyone. I am off to Earl Mays to get some DE if I can find it.