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      Fish come in a large variety of species, from several different geographical regions.goldfish can be set up as an unfurnished and bare-bottom tank to emphasize the bright coloration of the fish. A combination of different varieties of goldfish and decorations that contrast with the vivid colors of the fish would make an attractive display. Live plants are not usually grown with goldfish, except for hardy, oxygenating plants like aquatic plants, because goldfish regularly disturb the substrate. They may also feed on softer-leaved plants.Plastic plants can be used instead.

       Due to the larger surface area they present to the air; this allows more oxygen to dissolve in the water, and the more oxygen there is, the more fish you can keep. In general, a larger-sized aquarium provides a more stable water-world and the hobbyist can also acquire a greater number of fish.

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      A freshwater aquarium is a receptacle that holds one or more fresh water aquatic organisms for decorative, pet-keeping, or research purposes. Modern aquariums are most often made from transparent glass. Typical inhabitants include fish, plants, amphibians, and invertebrate , such as snails and crustaceans.

       Freshwater fish may be either cold water or tropical species. Although freshwater aquariums can be set up as community tanks,cold water and tropical fish are generally not mixed due to incompatibilities in temperature requirements. cold water aquariums house goldfish and other species that do not require a heating apparatus. Warmer temperatures would actually increase their metabolism and shorten their lifespan.