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Are you sure they died, or did they molt? When crustaceans molt they often hide more than usual for a few days as their new shells harden. They are more vulnerable to predation during that time, so they keep a low profile.
Molts are empty shells, where the animal inside broke out - they look like perfect replicas of the animal itself but don't have innards or eyeballs. In crabs usually they come out of the old shell through the bottom... like a "trap door" on the belly, as it were.
HTH
Jenn
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Member of the "J" Crowd & the BRW Crowd!
LFS Owner: Imagine Ocean
Just keep skimming, just keep skimming, just keep skimming, skimming skimming! What do we do? We skim, skim, skim!
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Instead of just building a reef in my home...I so wish I could afford to build my home in the reef! 
