Black Neon Tetra Pair

This underrated fish is one of our absolute favorites to recommend to both beginners and seasoned aquarists because they are so hardy and practically bulletproof. The 1.5-inch (4 cm) fish has a red eye with a pair of white and black horizontal lines down its body. Like all of the animals on this list, you will need to get a school of at least six fish (of the same species) so that they feel safe and protected from potential predators. Luckily, black neon tetras are very cheap so you can buy a huge group to fill up a larger aquarium. If you want to make a visually stunning design, we highly recommend putting them in a fish tank full of green aquatic plants and a red centerpiece fish like a betta fish. For more details, read our complete care guide.