PURPOSE: Provided is an aquarium realizing water ecosystems to include waterweed, plankton, a porous anion generator, fish, and water, which doesn't necessitate supplying fish and oxygen additionally and relives inconvenience to change water in the aquarium. CONSTITUTION: The aquarium comprises a porous anion generator, waterweed, plankton, fish, and water and doesn't necessitate supplying prey and oxygen additionally owing to forming water ecosystems under the proper condition for the living things to live. The waterweed is at least one selected from a group consisting of hydrilla verticillata, hornwort, water persicaria, najas graminea, and bladderwort. The fish is freshwater fish or tropical fish. The porous anion generator is at least one selected from a group consisting of basalt, charcoal, quartz porphyry, and germanium.
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