CO2 Changes - The Planted Tank Forum
 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 07-25-2011, 02:06 PM Thread Starter
Planted Member
 
PTrader: (0/0%)
Join Date: Jul 2011
Location: Fayetteville, PA
Posts: 152
CO2 Changes

Okay - so I got a pH controller that I am planning on using with my CO2 pressurized system, and I have noticed something interesting.... and yes my pH is a bit high - still trying to figure that out, but...

During the day, my pH is around 7.71-7.77

However, during the night my pH rises to 7.85-7.89

This confuses me - I understand that plants release CO2 at night, but wouldn't that "lower" my pH not raise it? So if that is true what would cause the pH to rise during night time - or when my lights go off?
RSidetrack is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 07-25-2011, 02:30 PM
Planted Tank Obsessed
 
PTrader: (10/100%)
Join Date: Feb 2011
Location: Dayton, OH
Posts: 357
Wouldn't that just be the off gassing of the co2? The amount the plants release has to be less than you inject during your light cycle... Or at least I would think so.
MoeBetta is offline  
post #3 of 8 (permalink) Old 07-25-2011, 03:17 PM Thread Starter
Planted Member
 
PTrader: (0/0%)
Join Date: Jul 2011
Location: Fayetteville, PA
Posts: 152
Quote:
Originally Posted by MoeBetta View Post
Wouldn't that just be the off gassing of the co2? The amount the plants release has to be less than you inject during your light cycle... Or at least I would think so.
I haven't gotten the CO2 set up yet - so I am not putting any in during the day.
RSidetrack is offline  
 
post #4 of 8 (permalink) Old 07-25-2011, 09:09 PM
Planted Tank Guru
 
Sharkfood's Avatar
 
PTrader: (2/100%)
Join Date: May 2010
Location: Pittsburgh, Pa
Posts: 2,536
Quote:
Wouldn't that just be the off gassing of the co2? The amount the plants release has to be less than you inject during your light cycle... Or at least I would think so.
Exactly.

The amount of CO2 the plants release is considerably less than what they absorb during the day. Otherwise they would shrink instead of growing.
Sharkfood is offline  
post #5 of 8 (permalink) Old 07-27-2011, 01:55 PM Thread Starter
Planted Member
 
PTrader: (0/0%)
Join Date: Jul 2011
Location: Fayetteville, PA
Posts: 152
Quote:
Originally Posted by Sharkfood View Post
Exactly.

The amount of CO2 the plants release is considerably less than what they absorb during the day. Otherwise they would shrink instead of growing.
Right - but my tank is going backwards...

I am not putting any CO2 in the tank during the day - not yet until I receive my new regulator anyways. So - if the plants are absorbing the CO2 during the day wouldn't the pH rise? And then during the night since there isn't any CO2 being absorbed, but rather released, the pH lower? My tank is doing the opposite.

During the day my pH is going down, and during the night it is going up.

Again - I am not putting any CO2 in the tank right now so it is just natural CO2 from the fish, etc. It's almost as if something is absorbing it during the night but not during the day - just seems strange
RSidetrack is offline  
post #6 of 8 (permalink) Old 07-27-2011, 02:32 PM
Planted Tank Obsessed
 
PTrader: (10/100%)
Join Date: Feb 2011
Location: Dayton, OH
Posts: 357
Indeed it does, sorry for misunderstanding earlier.
MoeBetta is offline  
post #7 of 8 (permalink) Old 07-27-2011, 02:34 PM
Planted Tank Guru
 
OverStocked's Avatar
 
PTrader: (76/94%)
Join Date: May 2007
Location: SoDak
Posts: 10,732
Recalibrate your meter. And changes of around .1-.05 aren't much. I'd look away.
OverStocked is offline  
post #8 of 8 (permalink) Old 07-27-2011, 02:52 PM Thread Starter
Planted Member
 
PTrader: (0/0%)
Join Date: Jul 2011
Location: Fayetteville, PA
Posts: 152
Quote:
Originally Posted by OverStocked View Post
Recalibrate your meter. And changes of around .1-.05 aren't much. I'd look away.
Just calibrated it on Friday. I realize they aren't much but it just seems weird to me that they are going in an opposite direction of what I would normally expect. Was hoping someone might have an idea of why
RSidetrack is offline  
Reply

Tags
None

Quick Reply
Message:
Options

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

Password:


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

Email Address:
OR

Log-in










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