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Old 01/15/2018, 05:32 AM   #13
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Join Date: Jul 2010
Location: Austin, TX
Posts: 1,624
In my maintenance business I've seen Alk, pH, calcium and mag each move independantly of each other and sometimes very quickly. It may not be "typical" but what you're seeing doesn't surprise me.

"Our crystal clear aquaria come nowhere close to the nutrient loads that swirl around natural reefs" Charles Delbeek
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