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I make home aquariums to simulate a naturalenvironment. Aquatic plants supply the oxygen needed by the fish, but often anaerating device is used to furnish additional oxygen. Goldfish enjoy coolwater, but the popular tropical fish must have water at a constant temperatureof 22°C (72°F) or more. I must keep the water pure and free of algae for longperiods by sufficient aeration and by keeping mollusks in the aquarium. A layerof sand or gravel at the bottom of the tank will hold the roots of suchimportant aquatic plants as tape grass, vallisneria spiralis, and aid in theremoval of debris. My home aquariums range in size from small fishbowls holdingtwo or three pets to huge tanks.