09-24-2011, 08:39 AM
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The only time you could possibly keep an angel in a 20 gal would be as a breeding pair, and it would need to be a 20gal tall tank, not 20 gal long which sounds like what you have. These would need to be the only fish in the tank..
You should see if you can't see any of these fish full grown in real life, that'll really put everything in perspective or at least it did for me.
Red tailed sharks are very aggressive fish and, unless in a very large tank with plenty of room to set up their territory, they can be very destructive. Adult angels can be the same way, although probably not as aggressive.. I'm not familiar with gourami, but I've heard they're aggressive as well. These three should not be kept in the same tank, or at least not in something so small. I'd say, at minimum something like a 75 gal
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