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Steve, my verbage was poor and I certainly agree with your analysis
below. I am a proponent of using CO2 and undoubtedly that will have
an effect on the PH level. What I meant to say was that I have seen
instances of people using PH 8.2 tapwater and then using a CO2
controller to maintain a level 5 PH. This in my opinion is not safe.
And for the record, I have seen fish go into PH shock even after
following proper temperature/other acclimation procedures.
I suppose what I should say is that I recommend people choose a PH
range that is appropriate for the fish and plants. Then decide what
carbonate hardness you want so that you have a desirable level of CO2
in the water. For example, in my example above where the individual
used PH 8.2 water, the carbonate hardness was close to 17. Keeping
the carbonate hardness constant and adding CO2 to lower the PH to
even 6 could prove quite dangerous to fish.
Steve Dixon wrote:
>Let's look at the implications of Julius' first sentence. The equilibrium
>level of dissolved CO2 in a water column exposed to air is fairly low,
>around 2 - 3 ppm CO2. This is well-below the optimum level for growing many
>species of aquatic plants. We might see a general increase in plant
>vitality at say, 10 - 15 ppm and a variety of plants seem to prefer 20 - 25
>ppm CO2. If we are not to artificially lower the pH by adding CO2, then we
>must not add ANY CO2 to the water column. Because as we know, adding CO2
>will in fact lower the pH. I wonder if Julius is recommending not adding
>any CO2 to our tanks to avoid potential fluctuation in pH or perhaps
>something else, such as not adding much CO2 to the water column.
Menlo Park, CA
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