11-12-2011, 07:03 PM
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I would not select gourami; all gourami species are sedate fish, and the high swimming activity of danio would not be welcome. Also, in terms of the environment, gourami are best in fairly well-planted tanks, since they are not swimmers but more cruisers, browsing among plants, dangling roots, branches, etc. Danio by contrast like to swim in streams and need open space.
Swordtail or platy [these are best not combined in the same tank] are OK with the danio in a 29g. You probably understand about keeping more females to a male with livebearers, and that consecutive batches of fry will appear unless you just have males. Just be careful not to overpopulate the tank; 12 danio is quite a number for a 29g., I would suggest 8 to be better.