KH, pH -> CO2 question... - The Planted Tank Forum
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post #1 of 4 (permalink) Old 03-02-2018, 11:15 PM Thread Starter
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KH, pH -> CO2 question...

I know the chart that gives the relationship between KH and pH. However...

My tap water has KH =2. I use baking soda (used to use Alkaline Buffer) to raise KH to 6.

pH of tap is 8.0. Running CO2 down to pH 6.6, according to chart should be 48!

OTH, if I use the original KH = 2, then my CO2 is only 16.7.

Just double checking that I have this right. By raising KH using baking soda, I have effectively increased my CO2? I am beginning to question the amt of CO2 in the water. The fish are never near breathing heavily. When I first started using CO2, there were times when their respiration was quicker, at the same pH I am running now. Perhaps I am oxygenating better.

Only change in tank was switching from Alkaline Buffer to baking soda. Could either of these cause a false reading?
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post #2 of 4 (permalink) Old 03-02-2018, 11:30 PM
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I don't much like the chart.

Ignoring KH of the tank I just target a pH drop of @ least 1.2
The "Phishless" tank gets a 2.2pH drop but after 1.6-1.8 pH drop I don't think anything gets better.

Are we growing plants or raising phish?
Prefer items that do not contain sodium (baking soda)
KH of 2 and even less can be great for many plants.

I'm glad all the Buce roots and such took off well.

If interested in plants PM me!
I'm trimming lots right now and the garden is growing.


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Growing is not that difficult.
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post #3 of 4 (permalink) Old 03-02-2018, 11:33 PM Thread Starter
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Quote:
Originally Posted by Maryland Guppy View Post
I don't much like the chart.

Ignoring KH of the tank I just target a pH drop of @ least 1.2
The "Phishless" tank gets a 2.2pH drop but after 1.6-1.8 pH drop I don't think anything gets better.

Are we growing plants or raising phish?
Prefer items that do not contain sodium (baking soda)
KH of 2 and even less can be great for many plants.

I'm glad all the Buce roots and such took off well.

If interested in plants PM me!
I'm trimming lots right now and the garden is growing.
Should be setting up the 75 in a little while. May need some more plants.

Ive just been dealing with more algae than normal. Either my EI dosing is too low (Ive been keeping nitrates <10ppm for fish), the CO2 is not what I think, or substrate nutrients are running out.

Was much easier when I was blasting tank with ferts.
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post #4 of 4 (permalink) Old 03-02-2018, 11:46 PM
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Quote:
Originally Posted by ChrisX View Post
Ive just been dealing with more algae than normal. Either my EI dosing is too low (Ive been keeping nitrates <10ppm for fish), the CO2 is not what I think, or substrate nutrients are running out.
Substrate nutrient loss is new to me, almost 1 year in but I'll never change to a different substrate.
Plants perform too well to warrant a change using capped soil.
I'm only guessing but assuming @ least 18 months on soil longevity.

2 tanks with phish that maintain 20ppm NO3 & 2ppm of PO4 with no phish or shrimp issues.
Macro dosing to maintain levels and micros are low(1x week) due to soil being used.
Some weeks are requiring a 2x EI macro dosing though.

The phishless tank is another story, same macro arrangement as needed.
Urea and micros daily now for 1 month, WTH it is a test that is doing well.


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