we are trying out first planted aquarium, 15g tall, and have a few questions about the DIY co2 method. We were going to follow this link
http://www.petfish.net/co2.htm. i am confused about this part. "
3. Run the CO2 line into the aquarium, through a check valve, and terminating in the aquarium. Pick a diffusion method, and have the CO2 bubbles go into your reactor of diffuser" What are diffusion methods, and how do we know which to choose? What are we using exactly, air line tubing? Also, I dont quite understand the injection part. Is that a whole other piece?
