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Pterophyllum scalare, also called Green Bulgarian Red Cheek, is a captive-bred variety of the common angelfish, selected for its green tones and reddish cheeks. It retains the tall, elegant body and distinctive behavior of angelfish, with extended fins and a noticeable social structure. The species remains very common in the aquarium trade, while this color variety is recognized for its appearance rather than for a specific natural location. Like all angelfish, it needs a spacious, tall aquarium, warm and stable water, and a varied diet. With proper care, it becomes a peaceful, expressive and long-lived South American cichlid.

General species description

Pterophyllum scalare is a South American cichlid with a laterally compressed body. Its triangular profile, greatly extended dorsal and anal fins, and long pelvic filaments create a highly recognizable shape. During growth, keeping young fish in a group allows pairs to form naturally. As adults, their hierarchy becomes more apparent, and a pair may defend a territory, especially during spawning. Angelfish are not usually aggressive without a reason, but they may chase weaker individuals or treat very small fish as prey. The Green Bulgarian Red Cheek is a captive selection, not a distinct wild population. The species is very common in the aquarium trade.

Geographic origin and biotope

Reference countries: Brazil, Peru, Colombia, Guyana, Suriname and French Guiana, within the Amazon basin and related drainage systems. The species inhabits calm or slow-moving water, including margins, side channels and seasonally flooded forest areas. Light is often filtered by riparian vegetation, branches and roots. The bottom may consist of sand, silt and plant debris. Natural water is warm and generally soft, often acidic to slightly acidic. In aquariums, stable water at 24 to 30 °C, with soft to moderately soft conditions and a pH around 6.0 to 7.5, suits most captive strains.

Precise location and local name

The species is associated with the Amazon basin and several tributaries, floodplain areas and connected wetlands. Since Green Bulgarian Red Cheek is a captive-developed variety, it does not represent a precise natural locality. In Spanish-speaking regions, angelfish is often called pez ángel, while the most common Brazilian local name is acará-bandeira. In English-speaking aquariums, angelfish is the usual common name. Commercial names generally describe color, pattern or fin shape rather than a geographic population. The variety name should therefore be distinguished from the scientific identity, which remains Pterophyllum scalare.

Appearance and physical characteristics

Pterophyllum scalare has a tall, strongly compressed body supported by long dorsal and anal fins. Filamentous pelvic fins emphasize its vertical profile. The Green Bulgarian Red Cheek variety generally shows a green or metallic green base color, with reddish to orange coloration around the cheeks and head. Intensity varies with age, strain, lighting, diet and emotional state. The eyes are often crossed by a dark line, and the body may retain more or less visible vertical markings. Adult body length can reach about 15 cm, while total height including the fins is considerably greater. A tall aquarium is therefore more important than a tank with only a large footprint.

General diet

Angelfish are omnivorous, with a strong preference for small animal prey, invertebrates and protein-rich foods. A good-quality pellet or flake formulated for medium-sized cichlids can provide the staple diet. It is beneficial to alternate this with frozen foods such as brine shrimp, mosquito larvae or finely offered krill. A small amount of plant-based food can also complement the ration. Meals should remain moderate to prevent excess waste and water pollution. Juveniles benefit from several small feedings each day, while adults can be fed once or twice daily. A varied and balanced diet supports growth, vitality and the expression of the fish’s green and red coloration.

Essential data

• River of origin: Amazon basin
• Local name used: acará-bandeira
• Origin of the scientific name: the genus name was created for angelfish; the species name scalare was established in nineteenth-century zoological nomenclature
• Etymology of the full name: Pterophyllum means leaf-fin; scalare means ladder-like, referring to the vertical bands
• Common/vernacular names: angelfish, freshwater angelfish, scalaire, Green Bulgarian Red Cheek
• Family: Cichlidae
• Subfamily: Cichlinae
• Name pronunciation: ter-uh-oh-FILL-um skuh-LAIR-ee
• Discovery: described by Johann Jakob Heckel Schultze in 1823
• Maximum adult size: about 15 cm body length; up to approximately 25 cm tall with fins
• Water temperature and pH: 24 to 30 °C; pH 6.0 to 7.5
• Watercourse appearance and surrounding vegetation: calm water, forest margins, roots, branches, leaf litter and submerged or emergent plants
• Typical tankmates: medium-sized tetras, pencilfish, robust corydoras, small loricariids, freshwater snails and other peaceful South American cichlids
• Temperament and behavior: generally peaceful, schooling when young, territorial as a pair and protective during spawning
• Water depth: calm and relatively deep areas of side channels and flooded habitats
• Sexual dimorphism: difficult to determine outside breeding condition; the genital papilla is the best clue in adults ready to spawn
• Bottom structure and flow: sand, silt, leaves and woody debris; low to moderate flow

In your aquarium

To succeed with Pterophyllum scalare, provide a tall, mature and well-filtered aquarium with open swimming areas and roots or vertical plants that create visual boundaries. Regular maintenance, consistent water changes and carefully selected tankmates help reduce stress. Avoid tiny, aggressive or excessively boisterous companions. Stability matters more than chasing a perfect number: clean, warm and well-oxygenated water supports long-term health. Offer a varied diet and observe interactions within the group. With enough vertical space, stable water and varied nutrition, this angelfish can become the centerpiece of a peaceful South American community aquarium.