Imo, a 75-gallon tank is too small for any Tang. As Naesco suggests, a 6' tank is much better suited to Tangs, although I think some of the smaller Tangs do pretty good in 4' 120-gallon tanks simply because there is a larger footprint. Tangs like horizontal space, depth isn't so important to them. If you ever have the pleasure of seeing Tangs in the wild you would have a hard time putting them into any typically-sized home aquarium - they sure love to zip around!
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~ Mindy
SPS fanatic.
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