The one thing that immediately springs to mind is the snowflake eel.
Although they're mainly crustacean eaters, they're opportunists and will take what they can get. I suspect the mandarin would become a meal, potentially along with the firefish, sixline wrasse and royal gramma.
I'd probably leave it out; cute as they are when they're little, they have the potential to take out a lot of smaller fish when they get bigger!
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