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Since sodium is the largest concentration cation in seawater by more than a factor of 20, it doesn't concern me if it rises some, especially in a fish only. Even in a reef tank, normal water changes go a long way to offset the rise in sodium and chloride. Craig Bingman shows the changes here:
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Chemistry And The Aquarium: Boron In A Reef Tank
This article also discusses the sources and sinks for boron in reef tanks, and shows that while typical tanks may be slightly depleted in boron with respect to natural levels, most are not so significantly depleted that any correction is required. Nevertheless, how to test for and supplement...reefs.com
What about people running reef tanks that never do water changes?


