Very cool Jim and great pics. What kind of crab is that? I don't know much about them as I never put one in my tank in fear of eating coral (even the reef safe ones). Does the crab ever leave the nem? I know my clowns dont....but might consider one if the crab stayed put and behaved himsef.
i just got a porcelain crab not to long ago. the thing just sits up in the rock work, and never moves from his perch. maybe when my nem get bigger he will hang out near it.