An aquarium is a special device designed to be a habitat for variety of water animals and water plants. The most common animals living in the aquarium (or fish tank) are different kinds of saltwater and tropical fishes, but people also use aquaria to hold amphibians, such as frogs, turtles and snails.
This hobby is one of the most popular and widespread all around the world, because it gives people a chance to observe the living ecosystem on a daily basis different from their own. Over 60 million people now as a hobby own home aquaria, and each year it gets many new fans. 
The earliest known aquarists were Sumerians, Egyptians and Chinese. They kept fish in artificial ponds and used it as food and entertainment. But, the true hobby of fish keeping become known and spread around the world in the 19 century.
These days the aquaristic is well known and studied discipline divided into three branches of freshwater, brackish, and saltwater (or marine) water animal keeping. So, no matter which kind of animals you decide to keep, you will find variety of articles on aqarium maintenance, and spending time on this hobby will bring joy and relaxation, not just to you, but all the people around you.    

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