I have four new birds that have been in quarentined for three weeks and I plan on adding them to my existing flock in two to three weeks. I have a few questions before I move them. One is, should I split the coop and run of the existing flock and add these birds on the other side? Also, do I need to do anything to the floor of the run before adding the new birds since it has previously been inhabited by birds. The floor is just natural dirt with barely and weeds/grass. If someone could please help me out it would be great. Thanks in advance.