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Re: [APD] KH goes UP after adding CO2
Hi Liz, thanks for the reply.
My pH went down from around 8.0 to 7.2, but by then the smaller fish
were at the surface.
I backed it off and just tested again a minute ago and the pH is 7.6.
It's hard to know what pH to shoot for when the KH is going up on me.
7.2 pH is perfect for a KH of 23 or so (43ppm CO2) but when that KH
moves up on me like that 7.2 indicates a CO2 concentration that can be
deadly. (55 ppm CO2 at 29 dKH).
I am surprised to learn that kH goes up with CO2 addition, I have been
studying this planted tank thing for a number of months in preparation
for my first try and had not read anything about this.
Liz Wilhite wrote:
> On 2/4/06, Barry Anderberg <apd at swoobs_org> wrote:
>> I can't figure out what it could be that is causing KH to go up..
> CO2. CO2 when added to water produces carbonate and bicarbonate. What did
> your pH do when you added the CO2?
> CO2 and water form a complex solution with species that occur at different
> ratios at different pH. If you have a solution that is saturated with
> carbonate and you add an acid to it you can see it fizz as CO2 is produced.
> This is the same kind of reaction that occurs when you pour an acid on
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