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Tiger barbs are schooling fish that should be in a minimum number of six. As long as you keep this number, aggression is in check and it prevents stress. If a barb is kept alone, it will be put to a lot of stress and become susceptible to ick. Even in this number, you should begin your prevention of ick from the store by choosing very healthy fish. Choose tiger barbs that are in schools as those that are separated are likely injured, stressed or diseased. Make sure you keep their water clean and feed them well so that you'll be rewarded with feisty and healthy fish.