My wife and I were given a hen and a rooster and they are awesome. But we need more hens to give Wilma a break. Their coop is 4' x 8' and the run is 15' x 30' so we have room but need to know if it is necessary to quarantine the 2 or 3 new hens we will be getting soon. If we have to do this how long before we can put them in with Fred and Wilma ?