crab id

I cant get a good picture but lets go with describing. I have a crab of a purple color. It seems to have forward fan sweepers that he wiggles back and forth. Next are his pinchers and i noticed him eating some string algae. He also has sweeper tenticles like a cleaner shrimp coming off the side by his eyes. Ive got a picture but the blur crab wont cut it.... Keep him or toss him?
 
Not sure, he fans the water with 2 arms like one of those japanese fans for staying cool. Hes very interesting and i researched it for bad and good, nothing. One off?
 
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