Due to my rocks, my calcium is 100ppm and magnesium is 8.7ppm. Is this ok? - The Planted Tank Forum
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post #1 of 7 (permalink) Old 05-13-2019, 06:23 PM Thread Starter
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Due to my rocks, my calcium is 100ppm and magnesium is 8.7ppm. Is this ok?

My rocks give off a ton of calcium. Gh is 16, calcium is 14 of that. They are gray with layers of flat white throughout them. I need to manually add magnesium to get any. I can't add GH boost since it adds even more calcium.


Is 100:8.7 ppm ratio OK? Do plants need a certain ratio to take up magnesium well? On a plus side, there is at least one amano molt almost every day (12 in the tank).
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post #2 of 7 (permalink) Old 05-13-2019, 07:25 PM
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That rock sounds like limestone like out of a cavern


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post #3 of 7 (permalink) Old 05-13-2019, 07:55 PM Thread Starter
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Here is a pic of it: https://imgur.com/a/avEJeTw
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post #4 of 7 (permalink) Old 05-13-2019, 08:00 PM
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That's fine, just use MgSO4 (Epsom salts) to boost Mg alone.

kH - 15 gH 17 (15 is Ca):



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post #5 of 7 (permalink) Old 05-13-2019, 08:17 PM Thread Starter
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Originally Posted by Quagulator View Post
That's fine, just use MgSO4 (Epsom salts) to boost Mg alone.

kH - 15 gH 17 (15 is Ca):



Cool. Thank you!
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post #6 of 7 (permalink) Old 05-18-2019, 09:54 PM
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You are about 12 to 1. Plant can handle a wide ratio range and but based on my research the tissue in a plant leaf has about 3 parts Ca to 1 part mg. I make my own GH booster with a 3 to 1 ratio. One time I let may plants bring it down to less than 1 degree before I noticed a slowing in plant growth. Once I did some checking and found the ratio can be wildly different between different rivers and will change seasonally . So as long as your high Ca levels are not causing any problems you should be OK.

I would consider removing the gray rocks. The rocks are probably limestone. high calcium levels can cause plant growth problems. but that said you pictures don't show any obvious issues. if you want to keep them I would weekly add some Epsom salt which is magnesium sulfate. Get the cheapest Epsom salt you can find and make sur it has no dies, perfumes or additives. Or you can order it fromNilocg.com sells 1 lb for 3 dollars. I would add enough to get it to doubt 15ppm which gives you a 6 to 1 ratio. You can use a nutrient calculator to determine how much to add.

https://rotalabutterfly.com/

Another option to avoid removing the rocks would be to coat them with a clear acrylic or epoxy sealant to isolate the rock from the water.

Keep in mind adding magnesium will increase your GH but if you don't excedd a GH of 17 you should be fine.
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post #7 of 7 (permalink) Old 05-19-2019, 12:30 AM Thread Starter
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I had to start dosing extra potassium as well as getting my magnesium up to at least 10ppm.

My plants were actually dying and bba was starting to grow. Now the tank is bubbling everyday all day but the old leaves with holes still died off.

I'm not sure if I was under dosing potassium and magnesium or what. I didn't dose potassium nitrate very often because my nitrates were already high enough. I did add potassium sulfate to make up for that fact but maybe it wasn't enough. People always say plants use very little potassium and magnesium so I thought it wouldn't be an issue to not track the potassium as much as nitrate and phosphate.

Magnesium... I was just lazy evause I thought testing for it was annoying. It's really just a matter of testing the api calcium test (modified for freshwater) and gh and doing some basic math.

Last edited by Ddrizzle; 05-19-2019 at 03:24 AM.
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