I have no intentions on moving my Naso into a tank bigger than 125, until my next upgrade, which I imagine is 5 years or so down the line.
At the end of the day, the so called "Tang Police" will say a Naso Tang won't be happy in a Tank smaller than 180 gallons. In my opinion, my Naso is stoked about life in my 75 gallon. He gets to eat whenever he wants, has no predators, no aggression at all in the tank etc.
The 125 is more about more room for my Corals than my fish, that said, I feel that a full grown tang, with the exception of Purple, Yellow and Scopa Tangs need 6' long tank. That said, the biggest tang I've seen in a Tank was a 14", 2" thick Hippo tang in a 5' 180. She was big, healthy and for all intensive purposes "happy".
My advice, deal more with Bioload, maintence. Get one or two "big" fish, a couple medium ones and some small ones.
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