Okay thanks for bearing with all of my upgrading questions lately -- trying to get my tanks in good shape now that they are finally aquascaped. (last weekend's drama

)
I purchased this reg from aquarium plants
http://www.aquariumplants.com/AQUARI...ST_p/co2-1.htm
I know I need some tubing, and am going to check out rex grigg's site for that -- but I need to know what else I may need -- do I need a diffuser or how exactly do I get it from the reg to the tank?