Here are some common aquarium fishes and why they are popular choices:

Guppies (Poecilia reticulate):
Colorful and vibrant, available in a variety of patterns and hues.
Hardy and easy to care for, suitable for beginners.
Males have gorgeous fins, making them visually appealing.
They breed readily, adding interest to the aquarium with their fry.

Tetras (e.g., Neon Tetras, Cardinal Tetras):
Small size and peaceful temperament, suitable for community tanks.
Schools beautifully, creating a mesmerizing effect when kept in groups.
Neon tetras, in particular, have a vibrant blue and red coloration, adding a splash of color to the tank.
Hardy and adaptable to various water conditions.

Betta Fish (Betta splendens):
They are known for their elaborate fins and striking colors, especially in males.
Can be kept in smaller tanks or even bowls, making them suitable for those with limited space.
They have unique personalities and can recognize their owners.
Males are territorial, which adds a dynamic element to the tank, but care must be taken when housing them with other fish.

Angelfish (Pterophyllum scalare):
Majestic appearance with their tall, triangular bodies and long, flowing fins.
Generally peaceful but may exhibit some territorial behavior during breeding.
They come in various color varieties, including silver, black, and marbled patterns.
Can grow quite large, making them centerpiece fish in larger aquariums.

Goldfish (Carassius auratus):
Traditional and iconic choice for aquarium enthusiasts.
They are recognizable by their bright orange coloration and rounded bodies.
Hardy and adaptable, suitable for both cold-water and tropical setups.
They have unique behaviors, such as rooting in substrate and nibbling on plants.

Corydoras Catfish (Corydoras spp.):
Bottom-dwelling fish that help keep the aquarium clean by eating leftover food and debris.
Peaceful and friendly, often seen in groups scavenging the substrate.
They have an endearing appearance with their armored bodies and barbels.
Compatible with a wide range of tank mates due to their gentle nature.
These fish are popular due to their visual appeal, ease of care, compatibility with various tank setups, and interesting behaviors, making them suitable for novice and experienced aquarium hobbyists.