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!
You can also go to public aquariums if you like fish, they have them in many cities.
yes, i've been to a huge aquarium in Baltimore. I loved it!
National Aquarium (Baltimore)
The National Aquarium - also known as National Aquarium in Baltimore and formerly known as Baltimore Aquarium - is a non-profit public aquarium located at 501 East Pratt Street on Pier 3 in the Inner Harbor area of downtown Baltimore, Maryland, in the United States. Constructed during a period of urban renewal in Baltimore, the aquarium opened on August 8, 1981. The aquarium has an annual attendance of 1.5 million visitors and is the largest tourism attraction in the State of Maryland. The aquarium holds
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