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ive used I think it was like 2lbs per gal for my 55..
id stay away from ecel, it puts a limit on what plants you can have. if you really want to go with extra carbon get a pressuised system, yeast based systems are far to sporatic to be of any use.
id stay away from ecel, it puts a limit on what plants you can have. if you really want to go with extra carbon get a pressuised system, yeast based systems are far to sporatic to be of any use.