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Old 11-13-2012, 08:22 PM   #3
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If I remember correctly from one of your previous posts, you had some sort of calcined clay - type substrate (can't remember the specific type).

Diana pretty much covered it - these substrates have a high CEC (Cation Exchange Capacity), and are known to strip hardness out of the water when it's first set up. Eventually it will 'fill up', and your tank will stabilize.
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