It's been years since I've had budgies but I never heard of letting them fly loose before adding one to the cage. I just put the new one in and they got along so well I soon added another. Budgies in the wild fly in huge flocks so, the more the merrier! I just got a bigger cage so they could fly and flutter around and get plenty of exercise. Enjoy (edit: YOUR) birds, I know you'll love them.
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