I'm sure it is but is your mag staying at a good level Alk won't rise or stay high with a low or fluctuating mag level, that's about all I can think about. Also I've read some stuff on GFO and Alk levels changing out too fresh gfo can drop alk levels a bit
Just my 2 Cents
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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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