Shrimp died can be due to lot of reason. Normally they have 12-18 months life span. Some able to survive more than 18 months. It is all depends on your water condition. You need maintain 0ppm/l of NO2 and Ammonia. Below 10ppm/l of NO3. Temperature is around 24-28C. Overdose of liquid fertilizer might kill the shrimp. They are sensitive with water change or PH/KH swing.
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