We have two flocks one flock is of 5 hens and 1 rooster that are around 18 weeks old and we have another flock of 22 chickens that are eight weeks old. We have raised both flocks since they were one day old. The older flock is already outside in their tractor coop, and has been since they were six weeks old. The younger flock is still in their brooder at night, but during the day they are outside in an enclosed "play area." My question is are there any tips from anyone on when we should put the chickens together, how to do it when the time comes, and are there any warning signs or anything like that that I need to pay attention to that would indicate something is wrong. Thanks for all the help in advance!