Buddy has a new friend(s)

Normally I only have my 2 macaws and 2 parrotlets (no one wants damaged birds, so I'll keep them forever) however I have 7 new budgies now. Honestly I have zero experience with them and never had so many of one kind before. One pair is the parents of all but one of the other birds, the parents are in their own cage, and the rest are split up between 3 other cages. One of the babies was constantly chasing another around so I separated the aggressive one out. Other than that they are happy and healthy, singing up a storm as I make this post.

So...

What the hell do I do with 7 budgies man? They are super cute, much bigger than my parrotlets, and I really don't mind their song, but damn that's a lot of birds! If I let them fly free in the house, will they continue to fight all the time? Are they scrapping cause there are too many in a cage? My macaws and parrotlets are free to roam the house all day and not caged at all, plus the little ones don't even get their cage locked at night. I don't really like the idea of the budgies being locked up at all, but again, I have no idea about that flavor of bird so if anyone has some advice, I'll take it.