Having an aquarium at home and sitting and watching fish in their habitat is said to be relaxing and calming. Other benefits of keeping fish are they are quiet, require little care and are inexpensive after the initial costs of aquariums and other equipment.
There are so many different fish to choose from.
Starter fish that are fresh water and easy to maintain include goldfish, guppies, mollies and sword tails. They are a good introduction to keeping fish for children.