The fish in the picture is the Atlantic Blue Tang, Acanthurus coeruleus. They get big (a little over 15"), have a big apetite for veggies, and need a very big tank.
It's a tang, which you probably knew. I searched 2 tang id sites, and didn't find it...but like wrasses, tangs can have a juvenile coloration that can make id more difficult.
Here is mine as a baby when I first got it 6 mths ago. Plan on keeping him awhile and put him in a 180 next yr as the 90 will not hold him long. Great fish and there is another thread about them. Here
Little guy was about 2" in the pic and is getting more blue as he gets bigger
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