I have a Naso Tang, Yellow Tang, Atlantic Blue Tang & Foxface ( Rabbitfish ) and they get along great
... these fish form the hierarchy in the tank with the Atlantic Blue being the dominant fish and the Foxface being the most timid but they all get along and there are never any squabbles ( the Blue just gets to swim anywhere he damn well wants hehehe
)
But if the Tang police get to you and you are feeling particularly guilty and such just let me know and I will find a home for the Regal or the Powder Blue
