08-13-2011, 12:03 PM
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As noted in the profile of Dwarf Gourami, this fish carries risks. A pair (male/female) in a 20g will work, in a 40g you could have a trio (1 male, 2 female) if you really want to go with this species. The health issue mentioned in the profile is very real.
The Honey Gourami is a better choice, and you could have a group of 5 in a 40g. Compatible fish should be quiet, no active swimmers which lets out barbs, danio, etc. Rasbora are ideal, or peaceful characins. Substrate fish are not usually an issue. Corys, one of the dwarf loach species, or one of the "oddball" catfish that are not large. Several are in the profiles.