Part of it depends on the particular gourami species. Any of the 3-spot/Trichopodus trichopterus color morphs (Opaline, Gold, Blue, etc) are a bit more on the fiesty side, while the Pearl or Moonlight Gourami are way more mellow. That said, if you keep a group of females even the 3 spot morphs tend to be fine. I have a mixture of 3 spot morph females with one pearl gourami female and they leave all my fish alone, including my guppies, juvenile threadfin rainbows, etc.