If the coral looked fine over the course of two months, I'd wager the crab won't be a problem, really. I had a pencil eraser-sized Acropora sp. frag that was right outside a little hole a 1" crab lived in, and the frag is doing great, now closer to the size of a golf ball. Crab never touched it.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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