Decorator crabs usually stay in hiding, IME/O, theyre not really worth getting.
I wouldnt worry about the decorator crab killing off your precious SPS speciens..... the anems they carry pack a tiny punch compared to regular sized colonies. On the otherhand it might not be the best thing if you want smaller invert populations to thrive.
Overall in my humble opinion, its not something worth spending money on.... yeah it looks pretty in the pictures, but how often are you going to see it?
And i wouldnt place any significance on the fear that it might hurt your coals, unless your adding a whole bunch to a small tank.
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