Paul B
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I have no idea but remember almost all my fish only die of old age too. I have a couple over 30 years old. I think people quarantine, (not you) and that severely shortens life spans as does medication.
This pair of hermit crabs lived over 10 years and my first coral banded shrimp pair in the early 70s lived 7 years.

I do have a problem when I get to many bristle worms and they get to big as they eat any invertebrate that molts.
This urchin just died after 12 years.

I also think not many tanks are set up correctly to replicate a real reef but I think that would more affect fish than shrimp.
This pair of hermit crabs lived over 10 years and my first coral banded shrimp pair in the early 70s lived 7 years.

I do have a problem when I get to many bristle worms and they get to big as they eat any invertebrate that molts.
This urchin just died after 12 years.

I also think not many tanks are set up correctly to replicate a real reef but I think that would more affect fish than shrimp.