is it causing anyproblems cause most tanks drop PH at night its natural and nothing to worry about, the ocean dose it. In the day there is a excess metabolic demand therefore increse gas exhange and in turn raise in PH while at night there is a slowing of everything and there for the ph drops and becomes more acidic .... unless you see a problem it probably did that way longer than when u strated to mesure it
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Current tank---125 gallon mixed reef 60 gallon sump, Reef octopus nw200 skimmer, Rapid LEDs, Maxspec gyre, Mp10s, Fuge, Biweekly 20% WC, QT everything
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