Blue Marbled Angelfish Care Guide - Aquarium Setup, Diet & Breeding

Blue Marbled Angelfish are a striking domestic variety of the freshwater angelfish, with a tall, laterally compressed body, elongated dorsal and anal fins, and graceful trailing pelvic filaments. Their marbled pattern combines silvery blue, charcoal and darker irregular markings, with considerable variation between individual fish.

Like other angelfish, they are intelligent, observant cichlids that often learn to recognise their keeper and become confident around the aquarium. Juveniles may school loosely, while mature fish become more territorial and can establish pair bonds or defend a preferred area.

In the wild, their high-bodied shape and long fins are suited to navigating among submerged branches, roots and aquatic vegetation. They typically move calmly through sheltered, dimly lit waters rather than swimming constantly in open current.

Blue Marbled Angelfish are selectively bred rather than a naturally occurring wild population. Their appearance can change as they mature, and the intensity of the marbling often depends on genetics, age and individual development.

Blue Marbled Angelfish are a cultivated colour variety of Pterophyllum scalare, a freshwater species native to the tropical Amazon Basin of South America. Wild angelfish occur across parts of Brazil, Peru, Colombia and neighbouring drainage systems, where they inhabit slow-moving forest streams, flooded woodland and quiet tributaries.

A group of Blue Marbled Angelfish should be kept in an aquarium of at least 200 litres, with a recommended footprint of roughly 120 × 45 cm and enough height for their long fins; a tank around 50 cm tall or more is preferable. Use fine sand or smooth gravel, tall plants, driftwood and upright roots to create shelter and visual boundaries while leaving open swimming space. Gentle water movement, subdued lighting and shaded areas help recreate their quiet, plant-rich natural habitat.

Adults can reach approximately 15 cm (6 in) in body length, while the combined height of the body and extended fins may approach 25 cm (10 in). Males are often slightly larger and more robust than females, although individual size varies.

Blue Marbled Angelfish are omnivorous predators that thrive on a varied diet. Offer a quality cichlid pellet or flake as a staple, supplemented with frozen or live foods such as bloodworm, brine shrimp, daphnia and mosquito larvae. Occasional finely chopped seafood and vegetable-containing foods can add variety, while suitably sized food should be provided for juveniles and adults.

Suitable companions include peaceful medium-sized tetras, larger rasboras, peaceful barbs, medium-sized Corydoras, bristlenose catfish and other calm South American community fish that appreciate similar water conditions. Avoid fin-nipping species, very boisterous tankmates and tiny fish or shrimp that may be viewed as prey. Male and female angelfish can become highly territorial when spawning, so breeding pairs may need separation from other angelfish and vulnerable community fish.

Blue Marbled Angelfish form pairs and spawn on a broad vertical surface such as a slate, plant leaf or aquarium glass. The female lays rows of adhesive eggs, which the male fertilises, and both parents may fan and defend the clutch. Eggs generally hatch within two to three days, with free-swimming fry following several days later. Young fish need very small foods such as freshly hatched baby brine shrimp until they can accept larger fare.

Mature males are commonly a little larger, deeper-bodied and more heavily built, sometimes developing a fuller forehead profile. Females may be slightly smaller and rounder through the abdomen, but these differences are unreliable outside breeding condition; the most dependable distinction is the breeding tube, with the female displaying a broader, blunt ovipositor and the male a narrower, pointed papilla.