CO2 and pH stability - The Planted Tank Forum
LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 01-08-2009, 05:44 PM Thread Starter
Planted Tank Enthusiast
houstonhobby's Avatar
PTrader: (3/100%)
Join Date: Dec 2008
Location: Houston
Posts: 612
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?

houstonhobby is offline  
Sponsored Links
post #2 of 2 (permalink) Old 01-09-2009, 03:23 AM
Planted Tank Guru
WfxXx's Avatar
PTrader: (125/100%)
Join Date: Dec 2003
Location: USA
Posts: 3,037
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.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

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


Quick Reply

Register Now

In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome