Hard to say unless you monitor the
CO2 somehow. An easy way to monitor is to check the PH of your water. If the
CO2 is absorbed, then the PH will go down. You can also do a de-gas method where you take water from your tank, measure PH, then leave uncovered for 24 hrs and re-measure. A drop of 1 ph point indicates 15ppm dissolved
CO2. I'm attaching a little chart to help you figure this out. I have another post of how I had my diy
CO2 before I moved to pressurized
CO2.
Good luck!