My brother builds aquariums for a living, to keep aquatic plants or animals in to be displayed or as pets.
That's pretty cool! I would love to have an aquarium 
Robert Warington actually created the idea for aquariums back in 1850. He explained that plants added to the water would give off oxygen to support the fish.
In 1850? Wow! That's a long time ago. I didn't know you have to have plants in aquarium. 
You don't have to, but it helps with oxygen. Especially if there are large numbers of fish or aquatic animals.
Oh, I see! That's very good to know!
water-filled tank in which fish swim about. Small aquariums are kept in the home by hobbyists. There are larger public aquariums in many cities. This kind of aquarium is a building with fish and other aquatic animals in large tanks. A large aquarium may have otters, turtles, dolphins, and other sea animals. Most aquarium tanks also have plants.
An aquarist owns fish or maintains an aquarium, typically constructed of glass or high-strength acrylic. Cuboid aquaria are also known as fish tanks or simply tanks
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