Hoping for some advice, please! We are new chicken owners & will be using an existing coop with attached run. The previous occupants dug 3 or 4 dust baths & I'm wondering if I should fill all but 1 in for the new occupants - my 6 little chickies! Also, any recommendations as to what to fill the unwanted baths with? Sand or dirt then cover with mulch? Something else? What do you add to your dust baths? Another thing I'm wondering about is whether or not I need a door or screen of some kind between the coop & the run? There's currently just an opening. Thanks in advance for any input!