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It could be acclimation as suggested earlier in thils thread. They can't regulate their internal salinity the way a fish can so they need an even more deliberate acclimation.
They peppermints and cleaners(Lysmata wurdemanni and amboinensis) don't have very long lifespans about two years in my experiience.
Predation by the (Psuedocheilinus hexatanenia) six line wrasse or the Coral banded shrimp(stenopus hispidus) or another fish or crab is a possibility,
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Tom
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