Finally got my pair of bloods today

after waiting what seemed for ever, I will be building a new holding aviary this month, the old holding aviary is 1.2m x 2.4m x 2m, can i have a pair of bloods, RC Cordons, normal mask and maybe one other (some sort of parrot finch) in this cage ?, would the red cheek on the cordon be a problem ?, i could let them loose in the large cage 6m x 4m. Today i seen 4 or 5 pair of Crimson finches keep in a mixed aviary, the aviary was about the same size as my large cage, is there any finches they won't mix with ?.
cheers Anthony