I've had nigers in my reef. They don't touch corals, but will go after shrimp and fish small enough to take bites out of. Actually, mine moved a coral all the time. I'd put it back, and he moved it again. We did this for weeks. No damage though, just picked it up and carried it to the other side of the tank. Small shrimps, crabs, etc, will likely be food.
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Brad
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