here is a list of things I have found to kill my variouse spcies of shrimp(learned the hard way)
-No big water changes, only 3 inches if you need a big water change do it over a week-
-aclimate thm very, very slowly-
-deepending about how many you have feed once a week, their stomachs are small, and slow-
-do not mix other tank water in with other tank water-
do not keep penies next to an open shrimp tank-
NEVER EVER USE ANYTHING WITH COPPER< TIN< OR IRON IN A SHRIMP TANK.
I hope this helps, also they like to be in groups of about 15-20.
And yes on shrimp scale they are hardy, but shrimp in their selves are really really, fragile, If you want a good hardy shrimp you could try a couple of vampire shrimp. If you can hold their max size of about 9-12 inches.