There are lots of Tangs that do OK in a smaller tank (60 to 90-ish) Any of the "reef cleaning" tangs such as Yellow Tangs happily clean rocks all day seemingly oblivious to their surroundings. It's just that the Regal is a free swimming plankton feeder that likes to roam, they just don't get the living in a box thing.
I can't bring my wife with me when I shop for fish, all those cute little baby Regals at the store have that puppy in the pet store window effect on her.
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