11-21-2006, 10:54 PM
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For gouramis, there's a bunch of choices of colorful ones good for beginners. You're familiar with the Blue, but there's also Gold, Pearl, Platinum, Sunset...and few others. All very colorful and peaceful. All the gouramis do best with at least 2.
Same with barbs, there are bunch of different kinds that will go well with your Tigers. Gold and Rosy barbs would add color to your tank, but it would be best if you get at least 3 of one them, the like to swim in groups.
A bunch of Zebra Danios, maybe 5 or 6 could work too. They are extremely hardy and good for beginners.
There are still lots of other fish that would go well with your tank. Do a little research and choose wisely. And make sure you don't overstock the 20 gallon, I wouldn't put more than 3 or 4 medium sized fish, or a school of around 6 or 7 small fish for the next additions.