waterdrop
Enthusiastic "Re-Beginner"
To me the biorb UG filter would explain the bouncing around. I believe they are just a bit difficult to get stabilized and cycled. WD
I can't wait to get to this point it looks exciting
Are you planning to dose some liquid carbon to help that not be a limiting factor in the plant performance?
Since you changed a lot of water the pH drop from 7.4 to 7.0 may just be the presence of CO2 that comes in at higher amounts due to the greater pressure in the water pipes. CO2 in water goes back and forth to the carbonic acid state (H2CO3) so you'll get some pH drop but will usually be temporary since the water will hold less CO2 at the lower pressure now that its out of the pipelines.
~~waterdrop~~
No, CO2 is just one of many substances that can be in the water and can exert their influence on the overall pH. CO2 is actually a rather mild "mover of pH." There are other stronger influences. For instance, during fishless cycling the final product of the cycle, the nitrate(NO3) will exist in the water in several different states, one of which is nitric acid (only a small amount, about 7%, will be in that state normally,) which can exert quite a strong acidic push and make the pH go lower if there are not other chemicals that counter that.Since you changed a lot of water the pH drop from 7.4 to 7.0 may just be the presence of CO2 that comes in at higher amounts due to the greater pressure in the water pipes. CO2 in water goes back and forth to the carbonic acid state (H2CO3) so you'll get some pH drop but will usually be temporary since the water will hold less CO2 at the lower pressure now that its out of the pipelines.
~~waterdrop~~
That's some interesting stuff right there. Is there a always a correlation between a lower pH having a higher C02? Is a pH of 7.2 going to have a higher concentration of CO2 than a pH of 7.6 ? Is the concentration of CO2 what makes the pH lower or higher?
Thanks WaterDrop for sharing your knowledge.