HI all this is my idea for a do it yourself co2 diffuser. I'll be using the output of my canister filter a siphon hose and siphon tubing. I drew a picture which you can see. It will be the output filter.....the siphon hose plugged into that....then that plugged into the siphon. The outflow of the filtered water will rush in into the siphon hose. It will be at the same angle pointed downwards as if you were doing a water change. The co2 tube will be running in from the bottom. The diffusing will take place inside the siphon tube and hopefully go into the aquarium out the bottom. I've been getting a lot of "it will move my gravel away" and I know...doesn't really make a difference to me.
So how does this all sound? I haven't tried it yet.