Now we're starting to talk big here. The 6.0cu.ft. AquaBead or AlphaONE boasts 6 cu. ft. of media and a carrying capacity of 300 lbs of fish. Something for the serious koi keeper. The koi keeper with a pond up to 17,000 gallons with flows up to 120 gpm. All this in a package only 30" X 40".