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Do you plan on just having tiger barbs? If so then it will probably fine. Just watch the water (ie test it) every so often and do changes if needed. If you want to add another type of fish then I would suggest adding more barbs.
Tiger Barbs are a lovely fish in big groups, But like tkos said be careful if you decide to add another type of fish. Tiger Barbs have a bit of a rep for nipping.