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Hmmm I've read they get 18". Even if only 10", I've heard they have the ability to swallow something 2/3 its size which could be a problem. Maybe someone who has kept a grouper will speak up.
If the grouper doesn't work out, you could always get a hamlet. They get about 5-6" depending on species and are closely related to groupers. They are extremely shy at first, but in time they warm up to the tank. A few of them are very beautiful.
Have you looked into the triggers of the Xanthichthys genus? Those would work just fine and might add to the "oddness" you're looking for.
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