Well being in the 8'er club I can say that my lg Sohal tang does do the whole length of my tank from time to time but most if not all of my other tangs really don't. I think a 6' tank is good for most tangs until they get up to 6-8" in body length not including there tail. If you place your rock so that they have lots of room to swim with some hideouts for the ones who like to go into areas like hideouts at night.
My current tangs are Sohal, Sailfin, Luitenent, Purple, Scopas, Orange Shoulder, Yellow & 2 Regals. once my 300 8'er is done there will be an Achillies added.
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