GH boost confusion - The Planted Tank Forum
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post #1 of 18 (permalink) Old 12-27-2015, 06:46 PM Thread Starter
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GH boost confusion

All the online calculators are saying to add 3 3/4 tsp ( 21g )once per week at your 50% water change.

This seems high compared to the other doses. Is it correct or are the calculators giving out wrong information ?

Thanks

75g tank

Last edited by reaper7534; 12-27-2015 at 07:00 PM. Reason: tank size
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post #2 of 18 (permalink) Old 12-27-2015, 08:23 PM
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Yeah thats correct. It all depends on how much you want to raise your GH. I dont have the equation on hand but its ez to find on here. I imagine that will raise your water by 3gh or so. I add around 1 tbsp, and a lil MGso4, but I have a starting Gh of 1.

Bump: Oh yeah I forgot to mention that if you start to dose Mgso4 (epsom salt) it will be the same way. That is that it will call for alot, as I guess most of it is water. Mgs04 raises Gh too so you have to figure out a balance of Gh booster, Mgso4, and or CaS04 if your going to use several things to raise your GH. I'm in the process of trying to add enough GH booster to raise the gh about 3 degrees, and then use Mgso4 and Cas04 to raise the gh another 3 degrees. Kind of playing around with trying to figure out if my plants are defcient in calcium. For w/e reason I dont feel that GH booster adds enough, even though its mainly made up of calcium and magnesium or w/e it is. However if you dont have soft water there is probably no reason to go to such lengths... My tap is 0-1 gh and 0-1 kh... its a real pita, and plants do not like to grow if a lot of gh booster isnt used.


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post #3 of 18 (permalink) Old 12-27-2015, 11:03 PM Thread Starter
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These are my parameters out of the faucet, BTW I'm on well water


Ph 6.8
Kh 5
Gh 5
Nitrate 0

My tank numbers before any dosing

Ph 7.0
Kh 5
Gh 6
Nitrate 5.0

I may be slightly off due to trying to tell the difference in colors
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post #4 of 18 (permalink) Old 12-27-2015, 11:22 PM
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you may have enough GH. But its better to check your local water report, to figure out the ppm of Ca AND Mg separately

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post #5 of 18 (permalink) Old 12-28-2015, 12:20 AM Thread Starter
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I'll have to find out how to have well tested, can't find any published reports. Am I going to hurt anything by dosing that amount ? Can I cut it in half just to play it safe ?
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post #6 of 18 (permalink) Old 12-28-2015, 06:33 AM
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GH boost confusion

Is there a specific GH reading to aim for in a tank?

What reading will ensure that our plants have enough calcium and magnesium ?

For example, my tap water has a GH of 9 according to API test. Is this a good level or should I add more?

Will adding more hurt anything? Cause algae? Like the OP, to raise it another 2 degrees, using zorfox's calculator, I would have to add 4 tsp of nilocs GH booster.

Thanks!
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post #7 of 18 (permalink) Old 12-29-2015, 08:27 PM
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Was wondering if someone can share their input. Thanks.
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post #8 of 18 (permalink) Old 12-29-2015, 10:15 PM
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Unless you have a calcium or magnesium test kit then you really dont know what makes up the gh of your tap water. Even with a gh of 9 I would suggest adding a little gh booster just to make sure you have enough.
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post #9 of 18 (permalink) Old 12-29-2015, 10:41 PM
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To elaborate on what nilocq said, in my case tap water has a GH around 8-9. But it's made up of a ton of Ca and very little Mg. So I add more of the latter via epsom salt.

Usually you can google your city or county's water report and get a rough idea what the ratio is.


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post #10 of 18 (permalink) Old 12-29-2015, 11:56 PM
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I live in San Gabriel, CA.

Here's what I think is the water quality report for 2015:

http://www.gswater.com/wp-content/up...an-Gabriel.pdf

The average reading for nitrates is 9

Calcium 34

Magnesium 11

Potassium 1.7

So, does my water ha e enough calcium and magnesium or should I add nilocs GH booster.

What's the ratio that ones has to aim for?
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post #11 of 18 (permalink) Old 12-30-2015, 12:12 AM
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3:1 - 5:1 Ca:Mg is what most people shoot for, although the jury is still out on how important having a certain ratio is in the first place. Just so long as there is enough of both.

I didnt look at the report but those levels sound fine, assuming the report is accurate. It wont hurt to add a bit of GH booster, enough to increase it a point or two. nilocq can better advise you on exactly how much.


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post #12 of 18 (permalink) Old 12-30-2015, 12:33 AM
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I would say you are probably good to go, if you wanted to add another degree of gh just to be safe that would be fine, but probably not needed.
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post #13 of 18 (permalink) Old 01-05-2016, 11:57 PM
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Despite my tap water having what appears to be the right amount of both Ca and Mg...my staurogyne repens seems to be deficient on Mg.


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post #14 of 18 (permalink) Old 01-06-2016, 01:28 AM
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The balance between Ca and Mg in your tap water is good.
To supplement I would use a complete GH booster, or else make your own with the right blend of Ca and Mg to maintain a ratio somewhere in the neighborhood of 4:1 Ca:Mg.
The most common GH boosters also contain potassium (usually K2SO4) and this is a good fertilizer, too. But if you are already dosing a lot of potassium some other way you might want to make your own GH booster.
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post #15 of 18 (permalink) Old 01-07-2016, 05:34 PM
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Quote:
Originally Posted by Diana View Post
The balance between Ca and Mg in your tap water is good.

To supplement I would use a complete GH booster, or else make your own with the right blend of Ca and Mg to maintain a ratio somewhere in the neighborhood of 4:1 Ca:Mg.

The most common GH boosters also contain potassium (usually K2SO4) and this is a good fertilizer, too. But if you are already dosing a lot of potassium some other way you might want to make your own GH booster.

Thank you.

I am using Niloq GH booster which is composed of magnesium:calcium:potassium 1:3:3

When using zorfox's calculator and set it at the estimative index method with a 2ppm raise I get these readings:



Now,

My tap water average reading for calcium is 53ppm and the average for magnesium is 14ppm.



As you mentioned most likely I already have enough of calcium and magnesium and there's no need to dose more. However, take a look at this picture:



Doesn't that appear to be a magnesium deficiency?

If it is, will the addition of my above dose of GH booster be enough to fix the issue.

Will the extra calcium make things worse? Will adding only 2.16 ppm of Mg be enough?

Since the above dose gives me 20ppm of K will that take care of K for the whole week or should I be adding more K when dosing Macros?

Or should I stop using GH booster and add Epsom salt to increase my magnesium levels instead.



By how many ppm should it be increased? Is the correct option MgSO4.7H2O?

Millions thanks for the replies
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