I agree with JJMR. I had a parakeet in with 4 male buttons and they wouldn't let anyone else in that cage, period, not even hens. I found them homes except for one, and I moved the parakeet, the quail, and added 2 baby quail and they are fine together now. Just because the cockatiel was the one with blood on it's beak, doesn't mean the other quail wasn't joining in. All 4 of mine jumped at the chance to bully the newcomer. They definitely don't want to lose their current position in the flock. Good luck!!