I've also seen a similar purple crab in my tank. I've only seen him for about a day and the most I see is his claw, seeming to rip off algae from the rock and is quite shy. Is this similar to the one you might have? I would also like to know the ID of this little guy!
Otherwise, I'm not too much help for your hitchhiker problem, but I'll google it and post you anything I can find out. Good luck with more ID's!
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