04-02-2012, 11:49 AM
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Yes, but my question would be, how accurate is the test? I've never messed with specific tests for minerals like calcium, except years ago when I got nowhere with CO2 and iron. A GH test will in most cases answer this question adequately.
For plants, a GH above 4 dGH (roughly 71ppm) is considered minimum. I have basically zero GH in my tap water, and I raise the GH (using Seachem's Equilibrium which adds calcium, magnesium, potassium and something else I can't now remember) to 5 or 6 dGH and my plants have really responded. If your GH is below 5 dGH I would consider a similar supplement. There are other methods too, depending upon your initial GH and pH and the fish species, as they can affect pH which Equilibrium does not.