09-02-2011, 12:17 PM
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First, welcome to Tropical Fish Keeping forum. Glad you joined us.
We have fish profiles under the second tab from the left in the blue bar across the top of the page; each profile has info on compatibility, special needs, numbers, tank sizes and water parameters for that species. If the common or scientific name used in the profile is identical in a post it will shade and you can click the name to see that fish profile, example Dwarf Gourami and Neon Tetra.
In the DG profile it mentions a pair in a 24-inch tank as maximum. In your 29g I would not go beyond this. But DG also have some health issues you can read about in the profile. A better Gourami that is very similar is the Honey Gourami, you can have a group of 3-4 of these in your 29g and it will be easier to find compatible fish too. Check this fish's profile.
There are many fish suitable to the gourami, but they need to be quiet, not active swimmers, because the gourami (all gourami species) are slow, sedate fish that do not appreciate lots of activity around them. Rasbora (under Cyprinids in the profiles) make good tankmates, and some of the tetra (under characins in the profiles).