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First off, there is no magic number when it comes to tangs. There is always a hierarchy system at play and whether there is just 2 or 10 they will each have their dominant position over another. Powder Blue's ARE dominant fish once fully acclimated and will chase just about any new addition, tang or not. If you want more tangs, I would add from the Zebrasoma Family except for the "Sailfin's".
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