CO2 and pH stability - The Planted Tank Forum
 
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post #1 of 2 (permalink) Old 01-08-2009, 05:44 PM Thread Starter
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CO2 and pH stability

In Houston my tap water is hard and high pH. Perfect for Africans but
I like SA tetras. Everything I read, everyone I talk to, tells me not to
mess with my tap water. Stability is more important than any particular
parameter value for the health of my fish.

I use pressurized CO2. No matter what my kH,
the CO2 will go from about 3 ppm to about 20 ppm each day when the
gas is turned on, and this will drop the pH each day by about 0.8.

Since we all do this, I think we can conclude that a swing of that
magnitude is not a problem.

How much of a pH swing does it take cause a problem for my fish, given
that the swing is not caused by CO2 levels above 25ppm, but is caused
(probably) by some maintenance issue?

Thanks,
Rod
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post #2 of 2 (permalink) Old 01-09-2009, 03:23 AM
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Some fish are more sensitive to change than other specie.
For instance Cardinal Tetra, the mistake I have seen many make is they make
the purchase, bring home and toss in community tank, they will all be dead by
the next day.

The question your asking, it will take a sharp drop-fast (I can't give a number)
to stress the fish, if injecting C02 and you see stress it is 95% C02 excess &
lack of 02, so add air/surface splash. you should anyway on a daily basis.
Then reduce/ turn down C02.

Craig

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Last edited by WfxXx; 01-09-2009 at 05:44 AM.
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