apologies if this is in the wrong section but i am wondering if i need a special tray or anything for a dust bath? i have 2 runs, 1 i think will need a try or something as there isnt really anywhere to keep the dust dry. the first run tho has the shed on legs so there is approx 12-18" of ground clearance and judging by the ditches in the soil under there the girls are already using it for dust baths. i take it i can just sprinkle some DE under there and leave it at that? does a dust bath have to be kept 100% dry, if so the other run will need something with a lid i think. thanks.