First, not new to fish keeping but inexperienced with CO2 and hi-tech tanks. I've looked at the Gla systems and that may be the way I go. I want a really good regulator ( do not want to deal with the potential of EOTD ) also, a ph reg. I'd like to give the business to a lfs, so is there a system comparable in quality to Gla available in stores? Not going paint ball, going with 5 or 10 lb tank. This system is for a 75 G plant ,fish, and shrimp community. I also will be installing a Fluval G6 w/ inline heat and maybe UV. Lighting tbd.