Try for every 2 weeks 20% ish but lately i've been doing some bigger ones (50% 40%) trying to get the tank back on track from a 1 month holiday, change my carbon every month and pretty much stopped using GFO now that im dosing Foz Down with the doser.
Still able to manually dose Mag Alk and run Kalk in the Ato. But pretty soon ill be setting up the doser to Dose Cal and Alk as the demand is getting more than kalk can candle
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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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