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Old 03-29-2007, 06:37 PM   #11
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First, verify the reading with another brand of reputable test kit. Second, what is the CA level of your SW you are using for water changes? What salt mix are you using?

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Old 03-29-2007, 07:24 PM   #12
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Good questions Lando...FWIW...my CA stays at about 400-420 and I don't add anything to my tank. All I do is PWC of 25% every other week. I use IO and my SPS corals are growing like crazy! Be careful when adding a lot of stuff to your system things can go wrong very quickly!

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Old 03-30-2007, 12:08 AM   #13
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Good points by all. Lando beat me to it by suggesting another test for Ca using a different kit. While the Salifert tests are pricey, you really can't beat them for accuracy. While I normally use API for my everyday tests, when I get a screwball result that doesn't make sense I have some Salifert kits that I pull out of the cupboard for a "sanity check." They usually confirm the fact that I might have missed counting a drop or vice versa, or gotten "heavy" drops!

Also... knowing what your source saltwater mixes up at, as Lando also pointed out, is crucial to knowing how to go about correcting any chemistry imbalance. If your source SW mixes up at 360 Ca (like my Reef Crystals does) and you want to maintain a Ca level around 400, you know you're going to have to dose - PWCs just ain't gonna do it.

The other point made by Tangster that bears repeating is "don't dose unless you can test for it." And that means both Ca AND alkalinity when you do a two-part Ca solution. In fact, the back of the B-ionic bottle mentions that when starting to use the product to test DAILY and adjust dosage accordingly.
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Old 03-30-2007, 07:51 AM   #14
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I'd tend to guess it's one of two things - 1) bad test kit, or 2) haven't done a water change in a long while.
I'm sticking with my very basic questions from very early in this thread. Try another test kit. That number (200 range) seems REAL low. I also asked what salt brand.

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Old 03-30-2007, 01:05 PM   #15
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thanks guys

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