You didn't mention anything about the depth or type of substrate. I would say you have a decent chance of keeping one with enough hobby experience. That being said, I personally wouldn't keep one in a tank that size. I believe for one to be happy and thrive, a good amount of rock and larger tank is necessary. Requirements are much like keeping a mandarin.
Even though the 55 is a common tank, it's pretty painful when it comes to reefs.
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-Eric-
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