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Hello
machine water
GH 2
Ca=10 Mg=2,5
KH 2
30 liter tank.new water tank
I have to add GH=?
Ca=?Mg=?
water change 3 times a week
every time change the water
I have to add Ca=?Mg=?
please help
 

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Do you have soil in your substrate?
I'm going to use google translate and my rudimentary Viet to translate.

Bạn có đất trong chất nền của bạn không?
 

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tap water contains canxi 10ppm, Magie 2,5ppm create GH:2

Very confusing! What is canxi? What is Magie?

Are you writing because your plants are not growing? A photo of your tank would help.
 

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Do you have CO2?
that‘s usually the main issue in a EI tank.
you can add 2 grams of CaCl2 and MgSO4 after a water change if you want but the main problem is CO2.

Bạn có CO2 không?
đó thường là vấn đề chính trong bể EI.
bạn có thể thêm 2 gram CaCl2 và MgSO4 sau khi thay nước nếu bạn muốn nhưng vấn đề chính là CO2.
 

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Plants don't need a lot of Gh. 2 degrees can work your calcium and magnesium levels are balanced. but it looks like you are a little low on magnesium. Your stem plants like they might be suffering from low Mg levels. Primary symptom of Mg deficiencies the loss of older leaves. you could try boostiingyour Gh to 3 with just epsom salt. magensium sulfate. But then your calcium might be a little low. Plants prefer 3 parts CA to 1 part Mg. best bet is to use a GH booster. to boost your GH to 3.

However also keep in mind that some fish do best in hared water. So depending on what fish your have you might need to run well above a GH of3.

How well is the inverted bottle CO2 working for you? I use if by very use it.
 

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Plants don't need a lot of Gh. 2 degrees can work your calcium and magnesium levels are balanced. but it looks like you are a little low on magnesium. Your stem plants like they might be suffering from low Mg levels. Primary symptom of Mg deficiencies the loss of older leaves. you could try boostiingyour Gh to 3 with just epsom salt. magensium sulfate. But then your calcium might be a little low. Plants prefer 3 parts CA to 1 part Mg. best bet is to use a GH booster. to boost your GH to 3.

However also keep in mind that some fish do best in hared water. So depending on what fish your have you might need to run well above a GH of3.

How well is the inverted bottle CO2 working for you? I use if by very use it.
I do not agree with this advice. If your GH is low, I wouldn't try experimenting with epsom salt in order to raise it when there are so many other ways of doing so that do not involve adding salt to your tank water. Epsom salt is just like any other salt - it is not good for plants.
 

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I do not agree with this advice. If your GH is low, I wouldn't try experimenting with epsom salt in order to raise it when there are so many other ways of doing so that do not involve adding salt to your tank water. Epsom salt is just like any other salt - it is not good for plants.
Epsom salt is MgSO4. It’s good in small dosage usually with Ca.
 

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2g in a 30L will yield Mg-6.57ppm, S- 8.67ppm, dGH- 1.52
This is from a calculator

I'm too lazy to count all the atomic weight and moles to do the math to your question :)
Found it (should have known it would be in "EPA"):

"A level tsp of Epsom's salt in 2 cups of water is a reasonable working solution. This Mg solution when diluted 1:500 in distilled water gave me a GHG of 1 to 2." on p.86 of "Ecology of Aquatic Plants"
 
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