ONe other thing I forgot to mention. You have lots of inexpensive options for the injector/reactor. You can direct the CO2 to the intake of a canister filter Cost = $0 and no CO2 equipment i the aquarium except the airline tubing. You can use a gravel vacuum tube cost =- about $10 check out thekrib.com for a pic or ask me. You can build an external reactor out of PVC parts and some fittings for between $10-$30 and get 100% CO2 abosorbtion and have *no* CO2 equipment in the aquarium. You can buy a reactor for anywhere from $20 - about $100. BTW, the Rube Goldberg award has to go to this version -- the most complicated and overengineered CO2 device I have ever seen, only about $140 Eurodollars ;-) : https://www.marinshop.de/openshop?00000af100000b0c0000e00f0000000468e57934 Good Luck, Scott H. __________________________________ Do you Yahoo!? Yahoo! Calendar - Free online calendar with sync to Outlook(TM). http://calendar.yahoo.com ------------------ To unsubscribe from this list, please send mail to majordomo@thekrib.com with "Unsubscribe aga-member" in the body of the message. Archives of this list can be found at http://lists.thekrib.com/aga-member/