Named after its coloration being similar to their coldwater counterparts, Koi Angelfish, scientifically known as Pterophyllum scalare, are among the most popular and iconic freshwater aquarium fish, cherished for their graceful appearance and dynamic personalities. Originating from the Amazon River basin in South America, these fish are distinguished by their large, triangular fins and striking vertical stripes, which serve as camouflage among the water plants and roots in their natural habitat.

Angelfish have a unique body shape that is thin and laterally compressed, allowing them to navigate easily through densely planted areas. They typically display a color palette that ranges from silver to dark grey, with several vertical black stripes enhancing their elegant contours. Through selective breeding, a variety of color patterns have been developed, including gold, marble, and even more elaborate forms like koi or veil-tail.

In the aquarium, Angelfish require a well-maintained environment with plenty of vertical space due to their tall finnage. They thrive in a setup that mimics their natural habitat—soft, slightly acidic water with a good amount of vegetation and driftwood to provide hiding spots and reduce stress. While they are relatively peaceful, Angelfish can be territorial, especially during breeding, and may exhibit aggression towards smaller, more active fish that invade their space.

Care for Angelfish involves maintaining clean and stable water conditions, with regular water changes and effective filtration to keep water parameters within suitable ranges. They are omnivores, and their diet in the aquarium should include a mix of high-quality flake or pellet foods, supplemented with live or frozen foods such as bloodworms, brine shrimp, and daphnia to ensure balanced nutrition.

Breeding Angelfish can be a rewarding experience. They are known to form monogamous pairs that, once established, will clean a flat surface (like broad leaves or aquarium glass) to lay their eggs. The parents exhibit fascinating brood care behaviors, fiercely guarding their eggs and, later, the fry, which they often shepherd around the tank.

Overall, Angelfish are a captivating choice for medium to large aquariums. Their care requirements and behavior make them suitable for aquarists with some experience who can appreciate and manage their needs. Their serene beauty and engaging nature make them perennial favorites in the aquarium hobby.