Initial CO2 set up parameters ? - The Planted Tank Forum
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 04-19-2013, 12:35 AM Thread Starter
Planted Tank Enthusiast
jfynyson's Avatar
Join Date: Apr 2013
Location: NC
Posts: 857
Initial CO2 set up parameters ?

Just ordered my complete ultimate CO2 system from AP (Carbon Doser, pH controller, ext5000 reactor, 20 lbs tank). Any suggestions on initial set up of the CO2 system in my 135gal to battle the green dust algae (i.e. what pH to target, bps, bubble sizes in the reactor, position/flow angle of circulation pump in tank)? You can see all of my tank specs on my tank profile page. I'll hopefully have nitrate data tomorrow or early next week when my test kit arrives.
jfynyson is offline  
Sponsored Links
post #2 of 4 (permalink) Old 04-19-2013, 07:05 AM
Darkblade48's Avatar
Join Date: Jan 2008
Location: Toronto/Singapore
Posts: 10,672
There are just too many factors to consider when it comes to pH, bubbles per second, etc.

Ideally, you want to maximize the time the CO2 bubble has contact with water (before it floats to the surface of the water), giving it more time to dissolve. The reactor should help you accomplish this.

You may want to purchase a drop checker to be able to estimate the level of CO2 in your water column (to ensure you are reaching ~30 ppm).


A Primer to Pressurized CO2 and A Primer to Planted Tanks
Eheim Pimp #362 - Eheim 2213 x2, Eheim 2028, Eheim 2217, Eheim surface skimmer and Eheim autofeeder.
Victor Pimp #33 - HPT272-125-350-4M
Darkblade48 is offline  
post #3 of 4 (permalink) Old 04-19-2013, 05:40 PM
Planted Tank Enthusiast
gSTiTcH's Avatar
Join Date: Feb 2013
Location: Jacksonville, Florida
Posts: 838
pH controllers are fun. I basically set mine to ~1.2 pH lower than what the tank water sits at without CO2 injection. Seems to be plenty for the plants. Of course, that's at what would probably be considered medium lighting (four t8 48" lamps on my 55g long)
gSTiTcH is offline  
post #4 of 4 (permalink) Old 04-19-2013, 06:35 PM
Planted Tank Guru
Kathyy's Avatar
Join Date: Feb 2010
Location: Newbury Park, CA
Posts: 4,182
Ooo, new toys!

I wouldn't start out with the controller set at 1.2 points below the pH of the tank water, start with more like .5-.8 and only if you are going to be able to stick around and check the tank often that whole day. I have gassed fish in 5 minutes and in 8 hours with different aeration and needle valve tweaks. I bet 1.2 points is a good amount of CO2 but the amount you can safely inject depends on the aeration of the water as well. You may think there is a great ripple on the surface and loads of oxygen and your fish disagree. Then every couple days tweak the controller a tenth of a point or so until you are over 1 point and then slow down to less than that.

If the plants aren't getting the basic nutrients all the nice CO2 and light you give them won't help though. Until I learned about dosing nitrate and phosphate I had green algae, green water, green spot algae and more. Those aren't a problem now. See the sticky in the Fertilizer forum for how tos.
Kathyy 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:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

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