CO2 injection and pH difference - The Planted Tank Forum
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 03-30-2006, 05:33 PM Thread Starter
PTrader: (0/0%)
Join Date: Feb 2006
Posts: 18
CO2 injection and pH difference

I am trying to decide whether to move my CO2 automatic injection system from a power strip running 24/7 to a power strip that is controlled by lighting timer. The CO2 system ran on a reset pH of 6.7. If I don't run the CO2 system, the pH will go up to around 7.4 or even higher, sometimes to 7.8, during the night. I wonder how you guys handle the pH swing if you don't run CO2 during the light out, how much is your pH difference, and will the pH different be harmful to plants and inhabitants?

GH ~9 degree
KH ~9-11 degree

sfish is offline  
Sponsored Links
post #2 of 5 (permalink) Old 03-30-2006, 05:45 PM
PTrader: (7/100%)
Join Date: Mar 2005
Posts: 120
I have my CO2 with the soloinoid with the light. When the light or on, the CO2 is on. PH swing is from 6.4 at the end of the lighting period to 7.2 in the moring when the lights come back on. Fish don't care and I have never had a problem.

jrneuzil is offline  
post #3 of 5 (permalink) Old 03-31-2006, 06:58 PM
PTrader: (0/0%)
Join Date: Aug 2005
Posts: 365
Yeah, there should'nt be that much of a swing...and you'll conserve a bunch of gas.
Adrian is offline  
post #4 of 5 (permalink) Old 03-31-2006, 08:37 PM
PTrader: (3/100%)
Join Date: Feb 2006
Posts: 106
Personally, I'm running a solenoid that is on the same timer as the lights and I see a swing from ph6.8 with the lights on to about ph7.5-7.6 with the lights off. I've not had any problems with either flora or fauna in doing so.
sparrow is offline  
post #5 of 5 (permalink) Old 04-01-2006, 07:27 AM
Planted Tank Obsessed
fusQer's Avatar
PTrader: (2/100%)
Join Date: Jan 2006
Location: San Antonio, TX
Posts: 376
if you guys dont turn the co2 off at night (or even if you do) do you have o2 depletion problems? i think im having those, so much that my beneficial bacteria are dying off. my fish are gasping in the mornings recently following a water change a few days ago. still havent solved the problem, ammonia is 0, nitrites are off the charts in the mornings, nitrates 10-20ppm. i have a xp3, 55g, i just bought a timer for the airstone which is gonna kick in between 12-8am i guess. then the lights and co2 come on at 9am.

i too am concerned about the PH swing, with the airstone it will probably go up quite a bit. tap is 8.3, i have it down to 6.9 with co2 injection. i hope the swing doesnt shorten any lifespans of my fish!
fusQer 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