Hi
I have what two males and one female...the two that I originally thought were the males turned out to be a male and a female (I only know this because they layed eggs last week-but, to my horror, I think the female ate them)...and the other one has to be a male- now knowing what I know.
The papa male and female would square off as you say, but not attack eachother. I always thought it was odd, because they would both chase the other ram unmercifully...they do this little sideways flutter at eachother- that I once thought was them trying to show dominance...boy, was I mistaken...now, they're total lovebirds...perhaps, you have a male and female...is one smaller than the other? does the smaller one have a pinkish belly? The fins on top (I'm terrible with the names) are shorter on the female also and she seems to be more speckled than the male...the fins that hang down are longer on the male...maybe this will help you figure out if what you're dealing with is a pairing off of a 'couple'...
Hope that helps a little, at least...
Ericka