06-16-2005, 07:21 AM
Join Date: Jun 2005
| | New CO2 Question
I'm new to planted tanks and i had a question about using CO2 to control Ph. I believe i understand the relationship between Ph, KH, and CO2. The Ph in my tank without co2 stays between 6.8 - 7 consistently but in order to inject co2 i need to raise my KH levels (which are near 0) and i would like a target Ph of 6.4 which means i would need to raise my KH to 2.5 if i want to keep 30ppm co2 in my tank. correct?
This leads me to my next question. If you have a co2 system with a Ph controller why not leave it on all the time and let the controller dictate how much co2 to inject based on the plants usage or lack thereof instead of turning the system on and off with the lights at night? If i had a KH of 2.5 and set a controller to inject co2 to a Ph of 6.4 and i shut the system off at night my Ph would raise to 7.0 - 7.2 if the co2 levels dropped to 8 - 5 ppm right? Wouldn't that cause an unhealthy environment for my fish, namely Discus?