Sorry to hear about the death of your Tiger Shrimp, but that is, unfortunately, a common occurence with shrimp kept under bad conditions before sale. The people you bought them from were probably keeping hundreds or thousands of them in the same tank (before transferring some of them to their sales tanks). Or, the wholesaler they bought the shrimp from kept them under bad conditions. Either way, the shrimp were probably pre-damaged already.
I hope your remaining Tiger Shrimp survive and, with some luck, you might get some offspring if they turn out to be male and female.
Thanks for the "treasure map" by the way.


Take care,
Mustafa