01-06-2010, 10:05 PM
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Welcome to the hobby. Unfortunately, the 15 gallon is not suitable for tiger barbs, and you would not be able to mix the ones you have with anything else. In that small space and in such few numbers, they will continually harass anything you put in the tank. Some have success with tigers in a 20, but IMO and E, a 29 is the minimum. I would return them and get 6 cherry barbs (3m/3f), a dwarf gourami and a few guppies (1m/2f). That would be a very active and colorful tank. The barbs and gourami will take care of any fry, so you aren't over run with guppies.