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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 two types of betta fish -- bubble-nesters and mouth-brooders. Breeding the Two Kinds of Betta Fish. Betta fish are an excellent species for beginners in the aquarium hobby because they are hardy and easy to care for.