The effect of peat-moss, PH, Co2 - The Planted Tank Forum
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post #1 of 3 (permalink) Old 02-15-2006, 08:01 PM Thread Starter
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The effect of peat-moss, PH, Co2

So I added peat-moss when i swiched out my substrate. My assumption is that my Ph will be slightly lower. With this lowering of my ph will there be a affect on my Co2 level reading?



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post #2 of 3 (permalink) Old 02-15-2006, 08:13 PM
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If you applied only a fine layer, there shouldn't be too much of an effect. If you put enough to change the water chemistry and make the ph drop, then your co2 readings will not be accurate because the co2 will not be the only thing lowering the PH.

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post #3 of 3 (permalink) Old 02-15-2006, 08:17 PM
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I made a similar thread here:

I am having a hard time gauging my CO2 concentration due to the peat and driftwood also. Best advice I've seen is to slowly increase CO2 until fish show signs of stress, then back it off a bit. A cup of tankwater left overnight should give a good baseline pH reading. For example, if tankwater left overnight shows a pH of 6.8 and your tank shows a pH of 6.4, the difference is most likely from the CO2 concentration of your current tank. You may be able to make an estimate of the CO2 concentration from the "chart" as follows, but I don't know how accurate it would be. Maybe the gurus can step in and correct me, but this might serve as a resonable guideline:

Let's say you make the following measurements.

Outgassed tap water:
pH 7.2
kH 5

Outgassed tank water:
pH 6.8
kH 4

Straight tank water:
pH 6.4
kH 4

You can see that your outgassed tank water reflects a difference of 0.4, so to use the CO2 chart as a rough estimate, you may be able to compensate for this by adding 0.4 to the observed pH level, which yields the following:

corrected tank pH - 6.8
tank kH - 4
estimated CO2 level from chart - 19 ppm

Is there any validity to this?
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