QUARANTINE all new birds!
I recommend quarantine of all new birds, and I mean putting the new birds in a separate room, with separate seed sacks, watering containers, and other supplies. Take care of your birds first, then feed and water the new birds. Look at the cage papers daily, and watch how the new birds look at various times during the day. How do they look at noon? Do they go to sleep early? Are they drinking normal amounts of water? Are they eating the proper amount of seed?
Please read this article, even though it seems long. And give it serious consideration!
The most important question you will ever answer!
https://ladygouldian.com/content/why-quarantine-new-birds
https://ladygouldian.com/content/why-quarantine-new-birds