I intially had the problem wiht the males not only bullying their mates, but the other male as well. I took all males back except one. I have 3 opaline females, 2 snakeskin females, 1 snake skin male (because he seemed to be the "boss" of the males), 1 female pearl, 1 female sunset (I think is what it is. Red with a blue top fin.), 7 long finned gold danios, and 4 ghost shrimp in my tank. NO one fights. The biggest opaline tends to get a bit testy at feeding time, but no real problems. My tank is planted with live plants and a few slate caves.