I dont know what maniac finches you all have, (lol)
but my finhces are such a good friends!
We have 7 males together in 100x45x50cm cage and they are all friends.
Never arguing or squabbling, just best friends.
And we have a smaller cage with 6 females,
same with them, never arguing or squabbling..
and we have cage with young zebras and few older once.
it is 100x50x50cm.. a little squabble, but thats about it
only "get of my perch.." thing..
video of the males
and the males are allways like that

BFF
(but there have been a squabble few times, but nothing serious)