01-04-2011, 01:50 PM
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I would recommend you return them and not get more Tiger Barb. They need to be in a group as you say, but a larger group, say 8 or more, to control their nippy aggressiveness. And a 30g tank is minimum for a group of 8 TB. While they are very attractive fish, and widely available, they are not the easiest fish as they really are not "community" fish due to their inherent behaviours. This is explained more in our profile, click on the shaded name to go there.
In a 10g tank, you have lots of options in small fish. There are the rasbora and tetra groups, selecting those species that remain medium and are not overly active (need more swimming space), and a group of 6 of one of these can work. Or select the "dwarf" species such as Ember Tetra, Boraras brigittae and similar dwarf rasbora species, Dario dario, and many similar. A group of 6-7 of 2 or even 3 of these would work; more interest in the tank.