Co2

luismoniz

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Jun 27, 2007
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Hi Tom,

My tank is better, thanks to this website and all the people here, thanks a lot.
I have one question, my ph is 7 and kh 2 of my tap water, in the end of the day the ph of the tank water is 5 i think becouse KH is to low, and ph down to quick, what you recomend? Up kh of the tank, with bicabornat?
Today i will do the drop checker 4dkh solution to make sure the co2 is ok!
Can i have good green color on drop checker with ph in 5?
Thanks for your time.

Regards,

Luís Moniz

*Sorry my bad english but i am Portuguese
 

Tom Barr

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Jan 23, 2005
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KH of 2 is fine, these days,. my tap is 1.2 KH.
I like soft water, I can add things if I want, or leave it(which I normally do, it's easier!).

Is this a non CO2 or a CO2 enriched tank?
You are too low on CO2 if so(a CO2 enriched tank).
pH ought to be about 6.4 or less through most of the light cycle using only more CO2 gas to lower it.

Regards,
Tom Barr
 

luismoniz

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Jun 27, 2007
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Hi Tom,
Is CO2 enriched tank, but if i add more co2 de ph comes down, like i said my tap water have 7 of ph but with co2 in the tank ph down to 5.
What you think i need do?

Regards,

Luís Moniz
 

ceg4048

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Mar 21, 2005
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luismoniz;19163 said:
Hi Tom,
Is CO2 enriched tank, but if i add more co2 de ph comes down, like i said my tap water have 7 of ph but with co2 in the tank ph down to 5.
What you think i need do?

Regards,

Luís Moniz

Hola Luís,
It's difficult to belive that the ph drop to 5 is due to only CO2 injection. Are you sure there are no other acidic sources in the tank? Do you have peat in the substrate or are you adding acid buffer by chance? According to the calculations, ph 5 at dkh 2 means that your CO2 concentration would be 600 ppm.

Either your pH or kH measurement is incorrect or something else in addition to CO2 is causing the pH to drop so much. Take a sample of water from the tank and let it sit for a few hours. Then measure the pH of the sample. Does the pH of the sample rise to 7? That might be one method to investigate if there are other acidic sources in the tank.

We will have a better idea when you get your drop checker and use 4 dkH water in it.

Saludos,
 

luismoniz

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Jun 27, 2007
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Hi,
I put drop checker the result is yellow, my ph is 6.5 and my kh is 5 today.
So i think i have to much co2 right?

Regards,

Luís Moniz
 

VaughnH

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If you are using 4 dKH distilled or DI water in the drop checker, and it is yellow, you have more than 40 ppm of CO2 in the water - too much.
 

luismoniz

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Jun 27, 2007
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Hi VaughnH,
Nice to meet you!
Yes i do all the process you say for the water, i think its correct :)
Thanks guys for your help, i will down my co2 and make the checker green.

Regards,

Luís Moniz
 

Tom Barr

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If you use ADA aqua soil , pH's are typically in 5's.
The drop checker can help pin point a good CO2 level.
4 dKH drop check solution will help.

Sounds like that was the issue.
Make sure you have decent current in the tank.

Regards,
Tom Barr
 

luismoniz

Prolific Poster
Jun 27, 2007
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Hi Tom,
Thanks for your help, i am glad you help me.
About my aquarium, this is one picture 3 months ago.
DSC03323v.jpg

Now the plants are bigger :) not all, vallisneria stop grow i dont know why :confused:
but yes, i use aquasoil amazonia and my ph is not no more on 5. now is 6,5!

Regards and sorry if my english is not good, I try

Luís Moniz

If you want see more of my tank you can see in my blog, but is in portuguese