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Calcium & KH
I performed tests for calcium and KH. Calcium was 60 ppm and 150 ppm as calcium carbonate. The KH was 3.92 dKH. For a planted aquarium, should the calcium( Ca2) be at least 100 ppm?
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.
The GH is 10 dGH. So then I am ok with calcium. I seen recommendations for 100 ppm calcium but I wondered if the recommendations meant calcium as calcium carbonate, hence my question. I did use Equalibrium but added a bit too much at 1 tsp per 20 gallons as I was looking for 8 dGH. So on my next water change (without Equalibrium in the makeup water) then it should lower the tank concentration some. I estimate my water changes at 42% . Thanks.
If your tap water is around 10 dGH, it is likely more than sufficient in calcium, since this is the primary mineral causing hardness. Regular (weekly) water changes of 40-50% will replenish the calcium adequately.
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