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As "decorating" is common in crabs, I suspect the crab is attaching pieces of coral rather than "growing" them...Diver Dennis:Tis is another Xeno from earlier. You can see how they grow appendages to look like the coral. Or maybe the coral grows on them?
Different photos elicit different reactions... in most of Dennis' shots it's "Wow! I have got to go find one of those!"catherine96821: