I'm tempted to buy one of these electronic CO2 unit that uses a carbon block instead of a gas. I can get a cheap one on eBay. Anyone tried these units? Impressions and opinions are welcome. -- Stuart Halliday http://theaquariumwiki.com/ _______________________________________________ Aquatic-Plants mailing list Aquatic-Plants at actwin_com http://www.actwin.com/mailman/listinfo/aquatic-plants