Dosing Magnesium, is it neccesary? - The Planted Tank Forum
 
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post #1 of 12 (permalink) Old 04-19-2005, 05:49 AM Thread Starter
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Dosing Magnesium, is it neccesary?

I'm starting to wonder...

What should I be looking for in terms of a magnesium deficiency?

I've never dosed it and I'm aware that EI doesn't take magnesium into consideration, but should i be adding some occassionally?


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post #2 of 12 (permalink) Old 04-19-2005, 06:47 AM
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This Site has helped me...
http://www.csd.net/~cgadd/aqua/art_plant_nutrient.htm

I dont dose magnesium either but would also like to know how people are dosing this.


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post #3 of 12 (permalink) Old 04-19-2005, 10:54 AM
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There have been some big threads concerning this in the general forum. Magnesium can be dosed from MgSO4*7H20 (epsom salt).

Here's my instructions for a 3:1 calcium:magnesium ratio premix:

1000 mL water + 14.89 grams CaCl2*2H2O + 8.32 grams MgSO4*7H2O

Dissolve thoroughly. 5 mL raises 1 gallon by 1 dGH. (Example - to raise 30 gallons by 2 dGH, add 300 mL of solution.)

The ratio is by weight and is based on calcium and magnesium molecular weights.

You can get the CaCl2 and MgSO4 from gregwatson.com.
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post #4 of 12 (permalink) Old 04-19-2005, 12:02 PM
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If your water source gH is over 3-4 and you do regular water changes you should not have to dose magnesium.
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post #5 of 12 (permalink) Old 04-23-2005, 11:36 PM
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Originally Posted by Curare
What should I be looking for in terms of a magnesium deficiency?
Have your plants become "irregular"...???
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post #6 of 12 (permalink) Old 04-24-2005, 12:20 AM
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Have your plants become "irregular"...???
If they do, don't stick your arm in the tank. And if you do, don't shake my hand.

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post #7 of 12 (permalink) Old 04-24-2005, 02:18 AM
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post #8 of 12 (permalink) Old 04-26-2005, 11:37 AM
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If one notices a calcium deficiency and begins to dose ca, is it a good idea to dose mg along with it? or is it not necessary?
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post #9 of 12 (permalink) Old 04-26-2005, 05:23 PM
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Quote:
Originally Posted by Hypancistrus
You can get the CaCl2 and MgSO4 from gregwatson.com.
By all means order from Greg but what is wrong with using epsom salt?

ernest

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post #10 of 12 (permalink) Old 04-26-2005, 07:25 PM
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Quote:
Originally Posted by Curare
I've never dosed it and I'm aware that EI doesn't take magnesium into consideration, but should i be adding some occassionally?
Err yea it does.
So did the orginal List of parameters and levels off of SFBAAPS.
I know I've always suggested folks to address GH, many trace element mixes also add some Mg.

GH says to add CaCl2/MgSO4 (generally a 4:1 ratio) or SeaChem Equlibrium to boost GH.

Extra Ca++ will not hurt.

If want some individual precise control, I doubt you'll gain much from this, as long as excess is there, the plants will be fine.
Most places' tap water with GH's or 5 or higher also have some Mg.

Topping off with a little MgSO4 is easy enough to see if it has any impact and will not hurt.

But few folks even know what Mg deficinecy really looks like.
I induced it some years back, I've never seen it in anyone's tank to date.

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post #11 of 12 (permalink) Old 05-02-2005, 04:39 PM
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Quote:
Originally Posted by e.lark
By all means order from Greg but what is wrong with using epsom salt?
Nothing wrong with it...just that most people don't need it. It's people using artificially softened water that are likely going to have issues.

And if Mr. Barr says something...he's probably right. Mg is such a trace nutrient to begin with, it should be way at the bottom of your list of 'nutrients to worry about'.

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post #12 of 12 (permalink) Old 05-02-2005, 05:21 PM
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Quote:
Originally Posted by malkore
Mg is such a trace nutrient to begin with, it should be way at the bottom of your list of 'nutrients to worry about'.
Very true, but it is the center of the chlorophyll molecule. Without it we wouldn't have much photosynthesis! My tap is only 2ppm Mg+2 (about 9ppm CaCO3 equivalent), so I add Epsom salt at each water change. My GH out of the tap is only 47ppm CaCO3 equivalent (2.6dGH).

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