The dominant neon dwarf rainbowfish in my tank is chasing the smaller less dominant male. The dominant one has a gold stripe down his head, so I'm guessing he's ready to mate. They're in a community tank with other fish but the dominant male only bothers the less dominant male. Is there any way to stop this from happening? Or lessen the aggression? As getting a 3rd male or more female. Currently there's 4 females and 2 males.