I am not sure what the 170 is but I'll check when I get home. It says that a normal aquarium should be 100-120 and if you are lower add buffer and higher consult an aquarium store. Using IO salt and have always had this problem. I am using and have always used nano-filtered well water. May have higher disolved solids. Using Nutrifin test kit where you add drops and multiply result by 10. took 17-18 drops to get the lime colour. I will check what the measure is when I get home.
Mike
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This all started with a ten gallon and two clowns.
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