I've heard a few stories about Sally Lightfoots similar to yours. Any crab can turn bad (even Emeralds, I know of at least 2 people who have had problems with them), though it only seems to be the larger types that will attempt to catch fishes (Sally Lightfoot, Arrow, etc.)
Perhaps you could trap it using a bottle trap or something?
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Calvin
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Planning a 29 gallon mixed reef...
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