BigbruiserAl
I ain't gettin on no plane fool
the fish would demonstrate more natural and interesting behaviour if kept in groups
edit: cockatoo apistos are quite peaceful and i really doubt u would observe any trouble from a 1m2f trio in such a large tank (large in comparison to the size of these fish anyway)
You find the apisto really chilled untill they take on breeding colours 1:2 ratio chances are they will pair. The females have a high chance of fighting to death. Now its only a chance depends if you want the hassle, i have about 60 cacs here but my last 2 breeding females did fight to the death. They will show no difference in behavior 1:1 or 1:2 in a tank so save the hassale and go for a nice pair