Upon double checking...I see you are testing for "KH". What test kit are you using to test for that? I'm assuming you mean dKH, which is degrees or carbonate hardness. At 15 dKH, that is awfully high.
Seeing as your alkalinity and calcium are so high, I'm wondering why you are under the impression that they should be at that level?
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~ Mindy
SPS fanatic.
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