Once you have damage the opportunity for fungal and bacterial attacks sharply increases.
treat your fish in a qt.
At the same time return the rabbit fish to the LFS or sell it online, I agree that it is far to big for a very small tank like yours.
May I suggest that you research your fish BEFORE YOU BUY. Cardinals need a peaceful aquarium. Rabbit fish wrasse and tangs are active and are not suitable unless you have a very large tank.
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