Fish are one of the most popular animals kept as pets. Just watching them swim in the the fishbowl makes you feel relaxed. They are relatively inexpensive to keep as well as low on maintenance.
Freshwater fish in particular is affordable and easy to keep and maintain — all you need is just water from your faucet and some decent water plants, and you’re good to go! You may add some fancy things such as a little ceramic house with holes for the fish to swim through, and a bubble wheel for added fun!