I know they are very common but I really like my yellow tang just for the flash of colour. Mine is a real SOB about other fish being introduced to the tank though so if you decide on that one make it the last fish you add. My all time favorite tang is the Achilles, which I do plan to get one of these days, but they are very very prone to ich and are probably the most challenging Tang as far as being more delicate and prone to disease (at least that's what my research tells me). Purple tangs are beautiful as well although it may not get along with the PBT that you already have planned. Kole tangs are nice and are great algea eaters although they are not one of my favorites as far as looks go. Tangs are beautiful fish but just about all of them need a lot of swimming room as they are all active and like to race back and forth in the tank.
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