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A discus is a type of tropical freshwater fish known for its round, flat body and bright colors. It belongs to the genus Symphysodon and is part of the cichlid family. Discus fish are native to the Amazon River basin in South America. In the wild, they live in warm, slow-moving waters with plenty of vegetation. They are relatively sensitive fish, requiring stable water conditions, which is why they are considered more advanced for aquarium keeping.