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Old 09/24/2017, 11:25 PM   #3
RC Mod
Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 87,254
I agree that those levels are fine. I might let calcium drop down to more like 400-450 ppm, and magnesium should be fine at 1275 ppm or so, but a bit extra magnesium won't hurt, and some people report less precipitation on tank walls.

Jonathan Bertoni
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