I tried a 2.3 once when I first started and it didn't work well for me. In my opinion... it is kind of a "king of the castle" thing. I believe male ASF's are more sexualy agressive when they are the only male in the tank and there are children to make.... I think when there is another male in the tank they are still in the "growing up with my friends" state of mind.... Not the "its time to grow up and make babies" state of mind they get into when it is one male and 3 or 4 females....

Putting my theories aside, two males will fight (you may not see it) wasting energy on each other instead of their lovely ladies.