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PH error why


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Using an inexpensive PH pen dipped into the shrimp tank it reads between 11 and 13. If I put tank water in plastic cup, reading is 7.6 which I expect. Reading pen dipped in 2 other tanks reading is 8.2, spot on. Any explanation? I disconnected heater and sponge filter in case that might be it. No difference. It makes NO SENSE.

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