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Old 09-07-2006, 04:32 PM
trilinearmipmap trilinearmipmap is offline
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As far as I understand, the product of calcium concentration multiplied by alk will reach a limiting level. Your alk is fairly high. Bicarbonate will react with calcium to form calcium carbonate, whether within a coral skeleton, coralline algae, or precipitation on the surface of the tank or equipment. So it is no surprise you can't keep your Ca level high enough.
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