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These include tropical fish, coldwater fish, marine fish and freshwater fish. Tropical Fish. These are the fish that live in either freshwater or saltwater but they need warm or tropical medium or temperature to thrive. Many types of tropical fish are popular aquarium fish because of their bright colors.
There are six types of danio commonly available: 1  Zebra Danios-With striking horizontal stripes, these active little fish make a handsome addition to any aquarium. They prefer relatively cool water and plenty of light. Pearl Danios- These beautiful iridescent fish are highly adaptable but do need plenty of oxygen, so make sure your aquarium has good filtration.