Thank you Blue. I was thinking the same things regarding animal behaviour and allowing them to acclimate in a less stressful way. I have other "moss wall" divided tanks, and I know the fish are aware of each other. Tsar, my extremely alpha copper green/white marble dragon(bragging just a bit, the fish is so gorgeous and flirts w/me every time I am in neighborhood :)) and his copper OHM (sorry, no name for him yet...ideas welcome...beautiful copper that flashes copper, bronze, steel, and dark green) friend on other side of wall, definitely communicate w/each other. Honestly, I think that the "moss wall" divider allows two male bettas to have friends (not just spawning partners) in a stress free way that they couldn't have in the wild.
Again: don't try this: the more likely outcome is a big brawl w/ injuries and death!