The angelfish is one of the most iconic aquarium fish, prized for its elegant triangular body and wide range of color morphs from marble to black.
Overview
The angelfish (Pterophyllum scalare) is one of the most recognizable and beloved aquarium fish in the world. This cichlid originates from the Amazon Basin, where it inhabits slow-moving rivers, flooded forests, and densely vegetated waterways. Its elegant triangular body shape, elongated dorsal and anal fins, and graceful, unhurried movements make it a true centerpiece of any aquarium.
Decades of selective breeding have produced numerous color morphs: marble, koi, black, platinum, blue, gold, as well as veil-tail forms with exceptionally long fins. In the wild, angelfish have a silvery body with dark vertical bars that help them camouflage among the stems of aquatic plants.
Adults reach 15–20 cm in length and can be quite tall thanks to their elongated fins. With proper care, their lifespan in an aquarium is 10–12 years. The angelfish's closest relative is the altum angelfish, which has an even taller body and more demanding temperament.
Tank Requirements
A pair of angelfish requires a tank with a minimum volume of 100 liters. Crucially, the tank height should be at least 40–50 cm, as angelfish have tall bodies and need vertical space. For a group of 4–6 individuals, a tank of 200 liters or more is recommended.
Optimal water parameters are: temperature 24–28°C, pH 6.5–7.5, and general hardness (GH) 3–10. Angelfish are sensitive to sudden fluctuations in water parameters, so stability matters more than achieving ideal values. A reliable heater and quality filter with moderate flow are essential — in the wild, angelfish live in calm waters.
The ideal setup mimics an Amazonian biotope: use fine sandy substrate, driftwood, and broad-leaved plants such as Amazon swords, cryptocorynes, and anubias. These plants not only create a natural environment but also serve as potential spawning sites. Subdued lighting will highlight the beauty of the fish and help them feel comfortable.
Feeding and Diet
Angelfish are omnivorous but have a pronounced preference for protein-rich foods. In the wild, they feed on small invertebrates, insect larvae, worms, and fry of smaller fish.
The staple diet in an aquarium should consist of high-quality flakes or pellets formulated for cichlids. Be sure to supplement dry food with live or frozen options: bloodworms, brine shrimp, daphnia, glassworms, and tubifex. A varied diet is the key to vibrant coloration and robust health.
Feed angelfish 2–3 times a day in small portions that they can consume within 2–3 minutes. Overfeeding is one of the most common mistakes — it leads to obesity and deteriorating water quality. A fasting day once a week is beneficial.
It is important to note that adult angelfish can eat very small fish, so fry and tiny species the size of neon tetras should not be considered safe tankmates.
Care and Maintenance
Angelfish are moderately demanding fish. They are fairly hardy but require stable conditions and attention to water quality.
Perform weekly water changes of 25–30%, using dechlorinated or conditioned water with parameters close to those in the tank. Regularly test ammonia, nitrite, and nitrate levels. Vacuum the substrate during each water change to remove leftover food and organic waste.
Angelfish can be susceptible to diseases such as ich (white spot disease), hexamita, and bacterial fin infections. The best prevention is stable water parameters, a balanced diet, and minimal stress. Always quarantine new fish before introducing them to the main tank.
Pay attention to fish behavior: healthy angelfish are active during the day, display fully spread fins, and have a good appetite. Darkened coloration, clamped fins, or refusal to eat are signs of potential problems.
Compatibility
Angelfish are relatively peaceful cichlids, but they cannot be called entirely harmless. They coexist well with medium-sized fish of calm temperament.
Good tankmates include larger tetras (such as Congo tetras and lemon tetras), rasboras, peaceful gouramis, corydoras, bristlenose plecos, and whiptail catfish. Avoid keeping angelfish with active barbs and other species prone to fin-nipping — the angelfish's long fins present too great a temptation.
It is important to remember that adult angelfish can eat very small fish such as neon tetras and micro rasboras. If you wish to keep them together, add the smaller fish to the tank first and choose large schools, but even then some losses are possible.
During spawning, angelfish become territorial and may aggressively defend their chosen area of the tank. Factor this into your stocking plan: provide enough space and hiding places for all inhabitants.
Breeding
Breeding angelfish is a fascinating process accessible to intermediate-level aquarists. Angelfish form monogamous pairs that can remain bonded for life.
To trigger spawning, slightly raise the temperature to 27–28°C and perform a large water change with soft, slightly acidic water. An established pair will begin meticulously cleaning a chosen vertical surface — a broad plant leaf, the aquarium glass, or a dedicated spawning cone.
The female deposits 200 to 400 eggs in neat rows on the prepared surface, and the male fertilizes them immediately. Both parents actively tend the clutch: fanning it with their fins to ensure fresh water circulation and removing unfertilized eggs that turn white.
Incubation takes approximately 48–60 hours at 27°C. After hatching, the larvae remain attached to the substrate for another 5–7 days, feeding on their yolk sacs. Once the fry become free-swimming, begin feeding them newly hatched brine shrimp or specialized powdered fry food.
Fry survival in a community tank is extremely low. For successful breeding, it is best to move the spawning pair to a separate tank of 50–80 liters. Some aquarists transfer the egg clutch to an incubator, but this means missing out on the fascinating parental behavior that angelfish display.