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#4
01-02-2016, 07:08 PM
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I perform a 15 gal water change each week but thats only 5% of my total volume. Each month I'll change out 1 cup of carbon and GFO which is again pretty minimal for the system size. Ca and Mg I'll test once a month as they don't fluctuate by much and after a few years of 0 I stopped testing PO4 and NO3. Alkalinity on the other hand can really jump or crash on me so I have to keep a close eye on it. I use a Ca reactor and Kalk reactor and once or twice a week add a few drops of Lugol's Solution.
Ca 400 - 500 Alk 9.5 ATM Mg 1400 1.025 78 F
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"We shall dive down through black abysses... and in that lair of the Deep Ones we shall dwell amidst wonder and glory forever." - H.P. Lovecraft Old 120gal Tank Journal New 225gal Tank Journal May 2010 TOTM The 10th Annual Prince George Reef Tank Tour 
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