I would get a doliatus rabbitfish. So far mine is the most peaceful citizen of my tank, under the right lights and in good health, they're spectacular to look at, and they put tangs to shame in the algae eating game. They also don't seem to be quite as susceptible to ich.
If you're looking for bigger fish, I would also add an Australian Harlequin Tuskfish and one of the reef safe(r) triggers, like a blue throat or a crosshatch (if you can both find one and stomach the price tag). The tuskfish are more reef safe than I think they're given credit for, but if you're planning on adding one, make sure you add anything with brightly coloured stripes or bands (like a copper band butterfly), or very small fish like some of the gobies before you add a tuskfish.
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