I think from the others posts I wouuld check first the Ammonia and let us know how you cycled the tank?
I am still a little unsure about that sshrimp with very little colour so you could remove that one and put it in a small plastic container and float it in the tank for now, though being such a low grade most people would just cull it anyway! A shrimp with so little colour I would imagine you will be able to see all of its insides, but they are a bit cloudy looking?
I think most people, me included, saw shrimp somewere, bought them immediately, then read up on them so you have aa head start on most people!
1 - test ammonia (and other parameters if you have the kits to do so).
2 - remove that suspect shrimp and float it in a small container for now, or cull it!
3 - Let us know what the test(s)/parameters are and what you did to cycle the tank! If you do the water change that JayC recommends make sure you add the new water very slowly, dripping is best! If you have the stuff and ability to do the other things per JayC do those where possible!
Simon
ps JayC, they are supposed to be blue velvet, he got 12 (from ebay) and 2 have died (that death rate is about normal for me from ebay within the first month).