Epsom salt/ MG - The Planted Tank Forum
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post #1 of 8 (permalink) Old 01-20-2006, 01:52 PM Thread Starter
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Epsom salt/ MG

I thought someone stated that if your GH is above 3 degrees it's best to add epsom salt/ mgso4?, did i read this correctly?, thanks
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post #2 of 8 (permalink) Old 01-20-2006, 05:23 PM
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The GH component of your water is made up mostly of Ca and Mg. I'm not sure why it would be 'best' to add Mg. It appears that in more cases (mine, I believe), a high GH can be predominantly made up of Ca, so you can still be Mg deficient. So, I'd guess that the likelihood of Mg being low is higher, so start by adding Mg if you feel you have a deficiency. If you are looking to just raise the GH, because you want to, then you should likely add both, and there's some proportion folks will recommend...though I haven't really thought through why that should really make a difference.

My thoughts,
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post #3 of 8 (permalink) Old 01-20-2006, 06:17 PM
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So here is a stupid question. If you have deceided to add Epson Salt, or MGSO4 where does one get it. Can you pick that up at Walgreens or what.

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post #4 of 8 (permalink) Old 01-20-2006, 06:26 PM
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Epsom salts should be available at any pharmacy. Or if you were ordering from Greg Watson you could probably add it to the order.
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post #5 of 8 (permalink) Old 01-20-2006, 10:17 PM
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The majority of hardness is made up of calcium, not magnesium. It's best to add a calcium compound (such as calcium chloride or calcium sulfate) to raise GH. If reconstituting RO/DI water, you should use a 3:1 to 4:1 calcium to magnesium ratio.

For example, Edward over at APC recently did an experiment and found that Rotala Wallichii stops growing when Magnesium levels reach 10 ppm. When he lowered the magnesium levels, it started growing again:

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post #6 of 8 (permalink) Old 01-21-2006, 01:16 AM Thread Starter
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I'm almost positive that Tom mentioned to add epsom salt if the GH is above 3 degrees, if i can just find that post.
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post #7 of 8 (permalink) Old 01-21-2006, 04:34 AM
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I think you should look into seachem equilibrium. Just a thought but I think it is recommended for people with a low gh.

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post #8 of 8 (permalink) Old 01-21-2006, 01:50 PM Thread Starter
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My GH is actually 10 degrees and i was surprised when i red that, i know that rex guide's says not needed if it's 3 or over i think, maybe it was a typo.
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