When my foxfaces have nipped corals in the past, I have found it to be a temporary problem. Even for established corals. Unfortunately, depending on the size of the coral colony, it could mean life or death for the coral.
I have found that by making a protective cage for the coral (usually out of eggcrate material) the fish will eventually ignore the coral.
Make sure that you have your foxface well fed with a varied diet.
Mitch
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