My 1 cent worth.
Firstly, u have mentioned the problem yourself. Gh might be too high.
Secondly, when was the last time you rinse/recharge your purigen? To my understanding, it works the same as activated carbon. Once the life span is up, if u dont remove, it will leech back into the tank.
Lastly, u spot it on as well. It boils down to the supply of shrimp. The shrimp u bought might be weak or sick. Another thing to note, shrimp are sensitive to changes. So u might consider proper acclimatisation if u are going to replenish stock.
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