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Unread 01/12/2019, 10:57 PM   #4
bertoni
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Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 88,616
Corals require calcium and alkalinity to form their skeletons. It's not clear that other elements are required, although they often are incorporated into the matrix. Food supplies and supplements also add trace elements, so I am not convinced that a calcium reactor is necessarily a better choice, although they are not limited by the evaporation rate, as Kalk often is.


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Jonathan Bertoni
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