Always good to do thatJust going to nit-pick* 1 Trichogaster trichopterus (blue/opaline/gold/three-spot gourami) or 1 lace gourami or 1m 3f honey gourami or 1m 2f dwarf gourami or 12 sparkling gourami
Actually, I found exactly the opposite from keeping them: in groups smaller than 6-8, the males would always attempt to go on a murder spree if there were any more around, but in deep 3 ft and standard 4ft tanks, groups of 10+ were much more successful, breading regularly and generally being peaceful.. definitely agree that they do much better in planted tanks. Maybe had something to do with there being enough females to keep the males busy with babies?Although tiny, I wouldn't advise getting 12 Sparkling Gourami together. Chances are you will get a few males in there, which will start a war zone. IME the males are pretty boisterous, aggressive and territorial when there are more than 1 males in the tank. Personally, I would only keep them in small groups with only 1 male, this way they are less aggressive AND less timid (Sparkling Gouramis are very timid FYI, not usually a good choice for no plants/lightly planted tanks)
Was suggested because in my experience do not bother anything at all (not even livebearer fry) if reasonably fed (read: not starved)..*1 Big Gourami such as Pearl Gouramis, 3 Spot/Opaline/Gold Gouramis, Moonlight Gourami but do this with caution...these Gouramis grow large and will eat anything that fits into their mouths, including small fishes (Lampeyes... ).