My plan is to have the tank water go through the wet/dry system and the CO2 will be added directly into, or just after, the power head. So the CO2 wont come in contact with any air until it is pumped back into the tank. Will that work? I will post a picture of what I am hoping my wet/dry filter will look like a little later but I am going to modify this idea (http://www.danoreef.com/DIY_5.5.htm) to make it a wet/dry filter in the first compartment, and the second will have a powerhead in it to pump water back into the tank. I want to add the CO2 into the plumbing of the powerhead pumping water back into the aquarium area. Will I still loose a lot of CO2 if I do that?