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  1. B

    PH Meter Problem

    Hi, I have a PH meter in my tropical tank which controls the flow of CO2 which has been in place for about 3 months. I have it set to PH 7.5 and everything seems happy - however, in the last day the PH is showing as around 3 to 4. I've tested the water today and the PH is somewhere between...
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