Marbled Angelfish Care Guide - Aquarium Tips, Diet & Breeding

Marbled Angelfish are a striking colour variety of the freshwater angelfish, recognised by their silver, grey and black marbled patterning. The irregular markings vary considerably between individuals, ranging from fine peppering to bold dark patches, and their tall, laterally compressed bodies are emphasised by long dorsal, anal and ventral fins.

These are graceful but purposeful cichlids that spend much of their time moving through the middle and upper levels of the aquarium. They can be calm and inquisitive, although adults often become territorial when pairing or spawning, and their confident behaviour gives them a strong presence in a community aquarium.

In nature, Pterophyllum scalare inhabit warm, slow-moving waters among submerged roots, branches and dense aquatic vegetation. Their unusual body shape helps them manoeuvre between vertical plants and woody cover, while their natural colouring provides camouflage among shadows and leaf litter.

Marbled Angelfish have been selectively bred in the aquarium trade for many generations, so pattern quality, body shape and fin length can differ between specimens. Although they are a domesticated colour form, they retain the social behaviour, breeding instincts and territorial tendencies of the wild species.

Marbled Angelfish are a cultivated colour form of Pterophyllum scalare, a species native to slow-moving and gently flowing freshwater habitats across tropical South America. Wild scalare populations occur in parts of the Amazon, Orinoco and Essequibo river systems, including Brazil, Peru, Colombia, Guyana and French Guiana.

A group of Marbled Angelfish needs an aquarium of at least 200 litres, with a footprint around 120 × 45 cm and generous height; a taller tank is preferable because adults have elongated fins. Use fine sand or smooth gravel, arrange tall plants, driftwood and vertical features around open swimming areas, and provide sheltered locations that allow individuals to retreat from one another. Gentle to moderate circulation, subdued lighting and floating vegetation help recreate their shaded river habitat. A secure cover is useful because angelfish can jump.

Males can reach about 15 cm (6 in) in body length, while females are usually closer to 12–13 cm (4.7–5.1 in). Including the extended dorsal and anal fins, large males may stand approximately 25 cm (10 in) tall, with females commonly reaching around 20–23 cm (8–9 in).

Marbled Angelfish are omnivores that benefit from a varied diet. Offer a quality cichlid pellet or flake as the staple, supplemented with frozen or live foods such as bloodworm, brine shrimp, daphnia and mosquito larvae. Small portions of spirulina-based foods or softened vegetables can provide additional plant matter. Feed modest amounts that are consumed promptly, especially with young fish that benefit from several small meals each day.

Suitable tankmates include peaceful medium-sized tetras that are too large to swallow, such as black skirt tetras or bleeding heart tetras, along with peaceful rasboras, larger corydoras, bristlenose plecos and some peaceful gouramis. Avoid fin-nipping barbs, highly aggressive cichlids and boisterous species that compete for space. Very small fish such as neon tetras, small shrimp and tiny livebearer fry may eventually be viewed as prey, particularly by large adult angelfish.

Marbled Angelfish form pairs and usually spawn on a broad, vertical surface such as a slate, plant leaf or aquarium panel. The female lays rows of adhesive eggs while the male fertilises them, and both parents may fan and defend the clutch. At around 26–28°C, eggs commonly hatch in two to three days, with free-swimming fry appearing several days later. Newly free-swimming young can be raised on very small live foods such as newly hatched brine shrimp. In community aquariums, eggs and fry may be eaten, so a separate breeding setup is often more successful.

Sexes are difficult to distinguish reliably outside spawning condition. Mature males may be larger, broader-headed and more robust, sometimes showing a slight nuchal hump, while females often have a smaller, more rounded profile. The most dependable difference is the breeding tube: females develop a larger, blunt ovipositor, whereas males have a smaller, more pointed papilla.