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Old 03-14-2008, 08:08 PM   #5 (permalink)
Lotus
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Join Date: Aug 2003
Location: Southern California
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I sometimes use the nitrate strips, just because they're faster. If I suspect a tank has high nitrates, at least I can get an idea from the strip. AP nitrate kits are hard to read above 40ppm, IMO. If it's red, time for a water change
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