One could easily get the impression that Eheim filters and pressurized CO2 systems are used exclusively by the best designers of planted aquaria. In the photos at the link, you will find a system using Fluval 104 and Hagen DIY CO2 with a ladder diffuser. (All credits to Oliver Knott, 'The Aqua Creator', screen name Plantella).
http://www.pbase.com/plantella/lu60
Andrew Cribb
http://www.pbase.com/plantella/lu60

Andrew Cribb