Planted Tank Obsessed
Join Date: Jan 2015
Location: Newmarket, Ontario, Canada
You could use a drop checker, but perhaps easier is to allow your tank to de-gas all the CO2 (ie turn off CO2 after lights out), and then take a baseline pH measurement in the morning. Increasing surface agitation will help speed up the de-gas process. The next morning (depending on the agitation) the pH will stabilize at its highest value. It is generally accepted that you have about 3ppm of CO2 in the tank at this point.
Now you want to raise your CO2 levels to about 20-30ppm. With a pH controller you simply set the target to be 0.8-1.0 lower than your pH baseline, and the CO2 will turn off at around 20-30ppm (0.8 drop might get you to 20ppm CO2, and a drop of 1.0+ will get to you around 30ppm CO2).
When you introduce your discus, repeat this process, and make sure they are not stressed as the CO2 levels rise. You may not be able to get the full 30ppm with discus.
Bump: Question ... is CO2 even running now, given the controller is set to 6.9?
Last edited by imcmaster; 05-25-2015 at 05:22 PM.
Reason: Is CO2 even on?