How to measure calcium so I can balance maganesium? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 03-07-2019, 05:01 PM Thread Starter
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How to measure calcium so I can balance maganesium?

Im using RO water in a 20 gallon long. Big gray rocks with white strips in it. My kh is about 9 or 10 and my gh is around 7.

How can I figure out how much calcium these rocks are putting in to get my gh that high, or do I assume it's all calcium as rocks typically dont have magnesium?

I'm realizing my magnesium is probably way too low in terms of Ca:Mg ratios and trying to fix it.
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post #2 of 4 (permalink) Old 03-07-2019, 10:20 PM
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How do I test for Mg? How do I test for Ca?

Same as API.
API Ca test kit can detect 0, 5, 10, 15, 20, … ppm Ca.
Get 20 ml of aquarium water, add 5 drops of #1 solution and mix. Start adding 1 drop of #2 solution and mix and watch for colour change from pink to blue. Each drop of #2 solution equals to 5 ppm Ca.

More about API Ca

Perpetual Preservation System
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post #3 of 4 (permalink) Old 03-07-2019, 11:34 PM
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Looks like Edward beat me to this one :-)
Only other piece of advice - use a clear glass container and place the container on a white paper towel. Makes seeing the color change much easier.
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post #4 of 4 (permalink) Old 03-08-2019, 06:05 AM Thread Starter
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Crap, I thought that test only worked in salt water for some reason. I guess its only the proportions that matter.

Thanks guys.
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