Fun fact about myself: I build aquariums for a living. 
Is that hard?
Well, the concept is simple-plants, water, and a container, but larger ones can be difficult
What is that thing aquariums have that filters out the bad bacteria and germs? The motor thing from Finding Nemo.
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
very first chapter, the author states "some say that what is good and what is bad are two different things, others that they are the same thing..I myself side with the latter group", yet by the end of this chapter, it has changed "I am trying rather to point out that it is not the same thing which is bad and good, but that each is different from the other Rosamond Sprague argues that good and bad cannot be the same and are, in fact, different from