Whoa! You should always have a quarantine period before you put two birds in the same room much less the same cage!! At least 4 weeks!
It's not a matter of people saying not to - it's for your birds health. And it's not just a recommendation. I really wish you would've researched this before you just put these 2 birds together.
And also, you can be causing A LOT of psychological stress by just putting these 2 birds together. On both birds.
Quarantine is very important!
Please read these links:
Introducing New Birds
Quaraine
Even though that's a finch site, the same questions/concerns apply.