CLOSED-LOOP ECOSYSTEM. This 3-gallon fish tank is a closed-loop, self-cleaning ecosystem. Using the science of aquaponics, the fish waste naturally fertilizes the plants above, and the plants, in turn, clean the water for the fish. Great for small pet fish and growing fresh herbs above. The double-decker combination of garden and fish bowl creates a symbiotic ecosystem. In the top tray, basil, mint, spinach, baby greens, and other edible or decorative plants thrive as nutrient-rich water is circulated past their roots. That process purifies the water, which is then sent back to the 3-gallon tank below, creating a happy, healthy habitat for a betta fish. The Water Garden makes an intriguing visual centerpiece for your own environment, whether that's on a side table or countertop, in an office, classroom or kitchen. Made in Union City, California. The Water Garden comes with everything needed to get started including: 3-gallon tank 5 grow pots water pump gravel for tank Growstones™ for pots organic seeds from Seeds of Change® (Genovese Basil and Wheatgrass) all-natural aquatic supplies and natural fish food from Kordon® HomeGrownPonics™ One coupon for a Betta fish from Petco®.