Magnesium level question. - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 06-27-2014, 11:03 PM Thread Starter
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Magnesium level question.

I know that I have hard water but today I got my water quality report in the mail and the reading was 15ppb.

So my question is, is this really high? I know if I don't dose gh booster I get stunting even if I dose potassium.


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post #2 of 7 (permalink) Old 06-28-2014, 02:22 AM
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ppb is parts per billion.

For magnesium that is very low.

What are the GH, KH, TDS and pH tests on the tank?

What livestock are you keeping?

What is the Ca, and general hardness in the water report?

Plants generally use Ca and Mg in a ratio not too far off 4 parts Ca to 1 part Mg.
The water does not have to have that exact ratio, but somewhere in the ballpark would be good.
Fish would like to have a certain range of GH, and that should include some Ca and some Mg. It varies with the fish. This is the test you use to see if your water is right for hard water fish or soft water fish.
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post #3 of 7 (permalink) Old 06-28-2014, 06:01 AM
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Sometimes you can have high GH tap water, but virtually no Mg.
Most times, there's enough.

Adding a bit more via say, MgSO4, epsom salts..........is easy to do, given you dosing past experiences, sounds like a Mg issue.

If the plants respond pretty fast to adding Mg, then you know what's up.
Mg deficiencies correct themselves fast, 1-2 days tops.




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post #4 of 7 (permalink) Old 06-28-2014, 11:18 PM Thread Starter
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Quote:
Originally Posted by plantbrain View Post
Sometimes you can have high GH tap water, but virtually no Mg.
Most times, there's enough.

Adding a bit more via say, MgSO4, epsom salts..........is easy to do, given you dosing past experiences, sounds like a Mg issue.

If the plants respond pretty fast to adding Mg, then you know what's up.
Mg deficiencies correct themselves fast, 1-2 days tops.
How much should I try adding and how often?


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post #5 of 7 (permalink) Old 06-29-2014, 04:35 AM
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If the rest of the water report shows very low GH and Calcium then I would use enough Seachem Equilibrium or Barr's GH booster to make the GH right for the fish you want to keep.

If the calcium is in the right range, then I would add enough Epsom salt to make the Ca:Mg ratio pretty close to 4:1.

If you want to try adding it and watch the plant response, then add enough to raise the GH by 1 German degree of hardness.
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post #6 of 7 (permalink) Old 06-29-2014, 12:34 PM
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Quote:
Originally Posted by will5 View Post
How much should I try adding and how often?
I may be wrong but it seems I've seen Tom recommend adding 1-2 ppm of Mg per week.
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post #7 of 7 (permalink) Old 06-29-2014, 02:04 PM
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I may be wrong but it seems I've seen Tom recommend adding 1-2 ppm of Mg per week.
That's about all the plants would ever use. I would dose around 4ppm per week to stay well above deficient levels. The extra won't hurt anything at all. That's about 1/4 teaspoon per 10 gallons.
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