Lobsters and arrow crabs: Do they Mix?

I've read that some lobsters have been known to go after certain inverts. But I've had my purple reef lobster in my 55 since December with no problems. He's in there with various hermit crabs, snails and a tuxedo urchin.
 
Mine's okay. They don't hang out in the same area. The lobsters like to hide while the arrow crab is usually out and about. The arrow crab actually runs away when the lobster comes out.
 
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