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I have 1 Naso tang(female) and 1 Purple Tang in my 72 gal. At first the naso tang didn't like it (because it was the first one) but now they don't bother each other. If you put tangs that look like each other (like the purple and the yellow tang how they have similer body styles) then they won't get along. I have always been told to keep them in groups of 5 or more.