I know I build things for fish to live in, but why is it called an aquarium?
I  have a big Aquarium in my back yard , is a vivarium of any size having at least one transparent side in which aquatic plants or animals are kept
oh cool!  What kind of fish can go in them?
As a Fishkeepers use aquaria to keep fish, invertebrates, amphibians, aquatic reptiles such as turtles
Can I just put water in there?  Or is there anything else I need to do?
Well,its simply .is a water-filled tank in which fish swim about
How long have people had aquariums for?
The aquarium principle was fully developed in 1850 by the chemist Robert Warington, who explained that plants added to water in a container would give off enough oxygen to support animals, so long as the numbers of animals did not grow too large. The aquarium craze was launched in early Victorian England by Gosse, who created and stocked the first public aquarium at the London Zoo in 1853, and published the first manual, "The Aquarium: An Unveiling of the Wonders of the Deep Sea" in 1854. An aquarium is a
Aquarium
An aquarium (plural: "aquariums" or "aquaria") is a vivarium of any size having at least one transparent side in which aquatic plants or animals are kept and displayed. Fishkeepers use aquaria to keep fish, invertebrates, amphibians, aquatic reptiles such as turtles, and aquatic plants. The term "aquarium", coined by English naturalist Philip Henry Gosse, combines the Latin root "aqua", meaning water, with the suffix "-arium", meaning "a place for relating to".