I have bought many shrimps over the last few months and many have also died. My luck is this: the ones that die are the bigger sized shrimps. If I buy the smaller ones (younger) they live well. Others have told me their experience is the opposite. Another thing to watch out for is when they are shedding - that's when they are the weakest. Can kena attack by a crazy fish or more agressive shrimp.

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The nose runs and the feet smell - go figure
Steven