I'm a little confused here. I think I read your posts right, Tom but maybe I am missing something..........
I believe you stated that co2 bubbles spread around the tank are better than liquid co2 for the plants. Placing one's diffuser disc below the output will give better results. I also think you said a little surface agitation helps also. The question is how can you do both? My output isn't a spray bar. If I set it low to push the bubbles around then I lose my surface agitation. Its a Fluval 204 on a 20 gallon high tank.
I believe you stated that co2 bubbles spread around the tank are better than liquid co2 for the plants. Placing one's diffuser disc below the output will give better results. I also think you said a little surface agitation helps also. The question is how can you do both? My output isn't a spray bar. If I set it low to push the bubbles around then I lose my surface agitation. Its a Fluval 204 on a 20 gallon high tank.