I saw the exact same thing go down in my tank last year. I don't know if the crab that was removed out of its shell might have been dead already. I watched my clean up crew go to town on the body and the crab scuttle away with his new shell. I had tow more blue legs and they would fight and nip each others legs off... the legs would grow back. I ended up removing all my hermit crabs since they were eating my sand sifting star fish, and were browsing my corals too much.
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