Looking at this thread and all the dogmatic answers makes me SO glad I quit CO2 and went back to low-tech. I'm sure that there is some good information here, but my tank is finally algae free, lush, and green and I am pretty happy!
still trying to sell my CO2 setup, though!
Couldn't you still inject CO2 on your low tech setup? I bet you would still see benefit. Why not use your CO2 since you have it or, until you can sell it.