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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.