Its a long process to make to birds behave when out together, at least it can be.
For us, the problem hasnt been that Stitch and Leroy dont like eachother, because they absolutely love each other, but rather the fights that occured every now and then.
Its taken alot of time, effort and planning to make it work, but now they can be out together for 2-4hours at a time without fighting at all, but just hanging out, preening and playing. Its awesome, and very rewarding to see, but it has taken a lot of work.
They are now only out together in the bird room, where they feel safe, whereas we tried to have them loose in the house at first (individually they can be where they want). The plan is to slowly increase their area, but my guess is this will take a long time. Its taken me about 10 months to get this to work as well as it is now
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Dont give up, it can be done!