I have 2 new male dwarf gouramis, used to have 2 male blue (3 spot) gouramis, but were too fast for my lil tank. The blue gouramis would chase each other pretty frequently. The dwarfs seem to have little discussions here and there about it, but have pretty much divvied up the tank to their satisfaction. I have lots of plants and caves, in my tank. I believe gouramis appreciate caves to establish their "home" and territory.