CO2 question - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 03-17-2009, 11:59 PM Thread Starter
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CO2 question

ok, so planted tanks using EI should be having 30ppm?

this chart https://www.plantedtank.net/forums/at...-co2-chart.gif says over 25ppm can be harmfull to fish? so what gives?


also my tap water is kh8 ph7.6
so at 30ppm CO2 my ph will drop to 6.9? correct?
if this is correct my ph will rise a lot doing 50% water changes!
which cant be good for the fish either!

now i want to succeed with my plants but not at the cost of causing my fish a lot of stress!

thoughts please!?
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post #2 of 9 (permalink) Old 03-18-2009, 12:05 AM
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Intermittent changes do to water changes will not cause undo stress to fish. 30 ppm is completely acceptable. Remember that kH pH charts are for situations where your only carbonate buffer is CO2. Highly unlikely in a planted tank with all the rocks, driftwood and crazy substrates we use.

You'll be fine.


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post #3 of 9 (permalink) Old 03-18-2009, 12:16 AM Thread Starter
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Originally Posted by gmccreedy View Post
Intermittent changes do to water changes will not cause undo stress to fish. 30 ppm is completely acceptable. Remember that kH pH charts are for situations where your only carbonate buffer is CO2. Highly unlikely in a planted tank with all the rocks, driftwood and crazy substrates we use.

You'll be fine.

new to this so dont quite get what you are saying, soz!

i have KH8, if my CO2 meter reads 6.9 i should have 30ppm CO2?
how do the other things effect it?
how do i know what my actual CO2 is then?
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post #4 of 9 (permalink) Old 03-18-2009, 12:26 AM
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The equation that the CO2 vs KH and pH is based on the assumption that there is nothing in the water that affects the pH except carbonates and CO2. That isn't the case with our aquariums, so that chart doesn't work.

If you get a drop checker, fill it with 4 dKH distilled water (not tank or tap water), and add a couple of drops of bromothymol blue pH reagent, and put it in the tank, the water in the drop checker will be green to yellow green when the aquarium has about 30 ppm of CO2 in its water. After that you can slowly, very slowly, increase the CO2 bubble rate looking for good pearling of the plants and for signs that the fish are being bothered by the CO2. Beyond that, you need to spend about $2000 for the device that can accurately measure the concentration of CO2 in the tank water.

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post #5 of 9 (permalink) Old 03-18-2009, 12:36 AM Thread Starter
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Originally Posted by Hoppy View Post
The equation that the CO2 vs KH and pH is based on the assumption that there is nothing in the water that affects the pH except carbonates and CO2. That isn't the case with our aquariums, so that chart doesn't work.

If you get a drop checker, fill it with 4 dKH distilled water (not tank or tap water), and add a couple of drops of bromothymol blue pH reagent, and put it in the tank, the water in the drop checker will be green to yellow green when the aquarium has about 30 ppm of CO2 in its water. After that you can slowly, very slowly, increase the CO2 bubble rate looking for good pearling of the plants and for signs that the fish are being bothered by the CO2. Beyond that, you need to spend about $2000 for the device that can accurately measure the concentration of CO2 in the tank water.
ok, so using the denerlle ph controller is only going to give me a rough idea of co2 content? and the drop checker thing i got with my CO2 kit will give me a more accurate idea of CO2 content even tho its only a colour comparision??
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post #6 of 9 (permalink) Old 03-18-2009, 12:56 AM
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correct the drop checker with known content is a more accurate gauge of the CO2 level.

http://www.njagc.net/articles/co2dropchecker.htm



Not going to steal their stuff but here's the link what and why.


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post #7 of 9 (permalink) Old 03-18-2009, 12:58 AM Thread Starter
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everyday is a school day!
thanks guys.
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post #8 of 9 (permalink) Old 03-18-2009, 01:06 AM
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Originally Posted by wkndracer View Post
correct the drop checker with known content is a more accurate gauge of the CO2 level.

http://www.njagc.net/home.htm


Not going to steal their stuff but here's the link what and why.
Your not stealing! The articles are there for a reason. They wouldn't be public if they weren't open to the public!

http://www.njagc.net/articles/co2dropchecker.htm


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post #9 of 9 (permalink) Old 03-18-2009, 01:16 AM
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Originally Posted by gmccreedy View Post
Your not stealing! The articles are there for a reason. They wouldn't be public if they weren't open to the public!

http://www.njagc.net/articles/co2dropchecker.htm

Alright, not my first poor choice of words. meaning I'd rather post a link to someone else's work rather than crop it over.


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