06-20-2011, 01:24 PM
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Welcome to Tropical Fish Keeping forum.
Well, sad to say, what I would have advised has already occurred. We sometimes learn the hard way, and as jeaninel said, we cannot always rely on advice from stores. Now you've found us though, and we can help.
We have fish profiles here, second tab from the left in the blue bar across the top of the page takes you there. In posts if the fish name (scientific or common) is exactly as it appears in the profile, it will be shaded, example: Blue Gourami or Trichopodus trichopterus, and clicking on the shaded name will open that fish's profile. Info on numbers of the species to have, minimum tank size (for the species alone), water parameters, compatibility, etc. is included in the profiles.
If you read the gourami profile you'll note this can be aggressive. One male and 1-2 females in your 40g would be fine. And some other compatible fish, maybe some bottom fish. Other mid-level fish would include the smaller peaceful barb, medium rasbora, or characins (tetra). Many species of these are in our profiles, and you'll find that some would work and some wouldn't with gourami.
And you can always ask us questions.