So I have 5 Original birds that are 12 weeks old. 2 weeks ago I bought 2 birds from a lady brought them home and realized they were sick(nasal and drainage sneezing). I called the lady and she gave me 2 different birds plus one for free. I was weary so I treated them with tetracycline treated water for 7 days and the new birds have been fine. I never introduced the old or the new birds to the original flock. My question is how long should I observe and segregate the new birds before I can introduce them to the old flock?