08-23-2010, 12:52 PM
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Frankly, all of this is a bad idea. Gourami and Betta are the same type of fish, anabantids. All anabantids are aggressive in varying degrees, the males particularly. Keeping more than one male gourami in a tank is the same as keeping more than one male Betta in a tank; only the Betta has heightened aggressiveness through decades of breeding this trait into it (the Betta is technically a domesticated fish) so it is more obvious. But the same inherent natural instincts are there in all anabantids.
The tank to house more than one of these fish has to be large. The profiles of each species explains this. And let me make something clear, I do not make up the profiles from my own imagination. They are extensively researched from several of the acknowledged authoritative ichthyologists and sites. I only include information that is consistent among all these authorities. Where one may differ, I will note that. You can take the information in those profiles as accurate.
As I have mentioned previously in these related and other threads, each fish has its own uniqueness, just like dogs or cats or people. The inherent traits though are there, programmed in by nature, and we cannot change them. One particular fish may be less aggressive in this or that setting, while another may tear its tankmates to shreds in a 90g tank. Inga had this experience; in her 4-foot 60g tank, one gold gourami killed the others. That was not all that unusual, it was normal behaviour for that species.
In addition to species profiles, we also have general information on the Family for most of the categories; click on the Family group name, like "Anabantids" and you will see the general information.