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An aquarium (plural aquariums or aquaria) is a place where fish and other animals that live in water are kept by humans. An aquarium can be a small tank, or a large building with one or more large tanks.
Keeping an aquarium is a popular hobby around the world. Careful aquarists (people who keeps aquariums) make sure their fish live in an environment similar to their natural habitats. This means caring about water quality, lighting, and food.
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