ca/mg dosing question - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 06-22-2008, 11:04 PM Thread Starter
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ca/mg dosing question

I don't know if there is a thread similar to this but I couldn't find one. I have very soft water around 0-1 KH and 0-1 GH. I want to dose CaCl2 and MgSO4 to increase my GH to around 4-5 dGH. I was wondering when the best time to dose would be. Should I just dose after each weekly 50% water change or should I dose on an EI schedule? Will the water hardness decrease over time from the plants using the nutrients?

If I dose after each water change should I just add enough to raise the new water to 4dgh, or enough for the whole tank?

I have a 29g tank, so I was thinking of adding 3/4 tsp of each to the 15g water change. Does this sound right?
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post #2 of 6 (permalink) Old 06-23-2008, 02:57 AM
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Here is an EI dosing strategy that includes Barr's GH booster.

http://www.barrreport.com/estimative...chy-folks.html

You only dose the GH booster the day of the water change. I am pretty sure that 2 tsps of GH booster in 40 gals raises the GH 3 dKH. You could use Seachem Equilibrium too but it is more expensive.
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post #3 of 6 (permalink) Old 06-23-2008, 04:22 AM
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You might want to raise your Kh too while you're at it.. Just add crushed oyster shells in your filter.


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post #4 of 6 (permalink) Old 06-23-2008, 11:53 AM
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Quote:
Originally Posted by captain_bu View Post
Here is an EI dosing strategy that includes Barr's GH booster.

http://www.barrreport.com/estimative...chy-folks.html

You only dose the GH booster the day of the water change. I am pretty sure that 2 tsps of GH booster in 40 gals raises the GH 3 dKH. You could use Seachem Equilibrium too but it is more expensive.
And after the intial dose to raise your Gh--then you only dose for the new water at WC--not the whole tank.


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post #5 of 6 (permalink) Old 06-23-2008, 02:45 PM Thread Starter
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I looked at the water quality report for my city, and this is what I found for hardness levels:

Ca: 7.7 ppm
hardness: 26 ppm which is 1.45 dGH

and with this equation I found:
(ppm dGH - (2.5 x Ca ppm)) /4.1 = Mg ppm

I have around 1.64 ppm Mg

The following calculations are based on 15 gallons of water which is what my weekly water change is.

So if I add 2 grams of CaCl2 that's an extra 12.72 ppm Ca which gives me a total of 20.42 ppm.

If I add 1.5 grams MgSO4 that's an extra 2.61 ppm Mg which gives me a total of 4.25 ppm.

This gives me a hardness of 3.834 dGH and a ratio of around 5:1 Ca:Mg

From a chart I got around .5 tsp CaCl2 and .375 tsp MgSO4. I know measuring it out is more precise but I'm fine with just estimating it a little.

Does this look right?
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post #6 of 6 (permalink) Old 06-23-2008, 04:26 PM
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Looks fine and is likely more than you or most anyone really needs to know to dose Ca/Mg. They are not some precise nutrient ppm's you need to grow ANY plant I know of.

I'll entertain anyone who thinks otherwise

As long as you are about a few ppm for Ca and 1-2 ppm for Mg, I think you are fine. If you want to add more, at such a low GH, I'd not worry about the starting point for the GH, I'd just add 1-2 GH degrees more of a balanced GH booster.

That's all.
You do not need the chem or the conversions or all that, you want to grow plants. Adding a bit more to prevent limitation is all you need to accomplish that goal.

Not some precise ppm.
There is no need with any fish or shrimp to run it really lean or low, so why worry about it? No need or risk.

Regards,
Tom Barr




Regards,
Tom Barr
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