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not sure if this will help http://www.thekrib.com/Plants/CO2/co2-narten.html let me know worked great for me in my old tank, some lasted about a month some longer, fairly cheap process though.

i am in a similar dillema. i have been trying to decide between a fluval 405 the fx5 (for its features) or a eheim 2229 wet/dry or a eheim 2128. after reading reviews i have knocked the idea of a 405 on the head and am interested in the fx5 because of its featues over the eheim. if people can...