Help! CrYstal red shrimp aka red bee shrimp?

With such a low KH, there is a possibility it was simply very defficient in calcium, which it needs to keep its exoskeleton healthy. Next time you try shrimp, consider adding some crushed coral, shells, marble, limestone, calcite, etc. to the filter, as these will leach calcium carbonate into the water for the shrimp to utilize. Also, check your nitrite, as this level is just as important as ammonia, but often overlooked.