you can get a 3x2 mortar tray from home depot that works freaking fantastic. just buy an ebb/flow kit from ebay and you are all set. i have all my setups this way. set them side by side for a 3x4 setup or long ways for a 6x2. This is my 5x5 tent and 6x2 closet. 6" rockwool cubes planted in 50L of hydroton in 21gallon trays.