Magnesium??? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 06-01-2006, 11:30 PM Thread Starter
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Magnesium???

Does anyone dose magnesium? I noticed a few older leaves on a few plants that are turning yellow'ish at the tips and started looking through the various deficiency symptoms and lacking magnesium fit the bill.

I have very soft water and I dose Seachem Equilbrium at water changes and I dose Tropica Master Grow 3 times a week. But, I did a calculation and at the doses I use (75 gallon tank, 1 tbsp Equilibrium per 20 gallons of water changed and 15 ml of TMG each 3x weekly dose) the magnesium content in my tank is only raised about 1.5 ppm (mg in Equilibrium is 2.41% and in TMG is .39%. According to Chuck Gadd's calculator target range should be 5-10 ppm.

Do those #'s that seem right? Thanks.
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post #2 of 6 (permalink) Old 06-01-2006, 11:39 PM
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Assuming "very soft" is a dGH of 3 or below, an added half teaspoon of epsom salts shouldn't hurt anything in a 75gallon tank. My dGH is only 3 and my Mg from the tap is less than 5ppm (as Mg, not CaCO3 equivalent). I add up to 3/4 teaspoon of Mg at each water change. Epsom salt is ridiculously cheap at the local drug/grocery store!

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post #3 of 6 (permalink) Old 06-02-2006, 12:11 AM Thread Starter
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The "natural" GH of my water is close to zero. Basically all of the hardness is coming from the Equilibrium. Given that, would a half tsp be enough?
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post #4 of 6 (permalink) Old 06-02-2006, 12:24 PM
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You could always skip the Equilibrium and use Epsom salts and a calcium salt (take your pick from Greg Watson or other sources). If you need to increase KH as well, use baking soda.

As far as amount, people with very hard water will tell you that the plants will do fine with excess Mg and Ca - it's difficult to get to the point of "too much" - go ahead and use a heaping teaspoon of Epsom salt with each water change.

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2g Mac-quarium. Clown gravel, fluorescent plastic plants, and 2 guppies.
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post #5 of 6 (permalink) Old 06-02-2006, 01:30 PM Thread Starter
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Thanks for the help KevinC.
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post #6 of 6 (permalink) Old 06-02-2006, 02:08 PM
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Epsom salt (MgSO4.7H2O) is included in many of the online aquarium calculators. The fertilator, over at APC, gives the following results:

-at 75 gallons of water, 1 teaspoon of Epsom Salts yields 1.68 ppm of Mg.

-suggested minimum amounts for Mg are around 3-5ppm, so I would go 2 or 3 teaspoons in a 75g.
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