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Unread 01/10/2017, 06:28 PM   #6
bertoni
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Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 88,616
The calcium level is important to coralline algae, as well as stony corals and clams. If you don't want to grow any of those organisms in your tank, it doesn't much matter what the level is, as far as we can tell.


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