Common Name: Altum Angelfish
Scientific Name: Pterophyllum altum
Other Names: Altum Angel, Orinoco Angelfish
The Altum Angelfish is a captive-bred example of the most sought-after of all angelfish species. It is the tallest of the angelfish species, with a strikingly deep body, a distinctive notch above the snout and long, sweeping fins. Its silvery body is crossed by dark vertical bars, often with reddish tones in the fins. Angelfish are among the most recognizable aquarium fish in the world.
Habitat and Distribution:
Altum angelfish come from the Orinoco basin and upper Rio Negro, in Venezuela, Colombia and Brazil. They live in very soft, acidic blackwater among submerged branches and roots. Blackwater habitats are stained brown by tannins from decaying leaves and wood, and the water is typically very soft and acidic.
Size and Lifespan:
Altum angelfish grow to about 7 inches (18 cm) long and can stand 12 inches (30 cm) or more tall including fins. With proper care they can live 10 years or more.
Diet and Behavior:
Altum angelfish are omnivorous and feed on small invertebrates, insect larvae and small fish in the wild. In the aquarium, offer flakes and pellets along with frozen bloodworms, brine shrimp and mysis. They are peaceful and social, do best in a group, and may eat very small fish. Feed a varied diet and remove uneaten food promptly to protect water quality.
Breeding and Reproduction:
Altum angelfish are open spawners like other angelfish, laying their eggs on vertical surfaces and guarding them as a pair. However, they are much harder to breed in captivity and usually need very soft, acidic water, so captive-bred altums remain relatively uncommon.
Aquarium Care and Tank Requirements:
A tank of at least 75 gallons with at least 24 inches of height is recommended for a small group. Provide tall driftwood branches and roots, gentle water movement and pristine, stable water quality. The water temperature should be kept between 82-88°F (28-31°C), with a pH of 4.5-6.5 and soft water. Efficient filtration and regular partial water changes are essential to maintain water quality, and new arrivals should be acclimated slowly.
Ideal Tank Mates:
Good tank mates include peaceful blackwater fish such as medium-sized tetras, hatchetfish, corydoras, small plecos and discus. Avoid fin-nippers, boisterous fish and anything small enough to be eaten. As with any aquarium, introduce new fish carefully and watch for signs of stress or aggression.
Difficulty Level:
Advanced. Altums are sensitive to water quality and need warm, very soft, acidic water, although captive-bred fish are generally more adaptable than wild ones. It is recommended only for experienced aquarists with the resources to meet its long-term needs.
Water Parameters:
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Temperature: 82-88°F (28-31°C)
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pH: 4.5-6.5
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General Hardness (GH): 1-5 dGH
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Carbonate Hardness (KH): 0-3 dKH
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Ammonia: 0 ppm
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Nitrite: 0 ppm
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Nitrate: <20 ppm (regular water changes required)
Additional Information:
- Altum angelfish are best kept in a group, which helps them feel secure and reduces shyness.
- Captive-bred altums are generally more adaptable than wild-caught fish, making them a good introduction to the species.
- Fun fact: The name altum comes from the Latin altus, meaning tall or high, a nod to this fish’s remarkable height.
The Altum Angelfish is a spectacular, show-stopping fish for keepers ready to provide a tall blackwater aquarium. With the right setup and care, it will be a rewarding addition for many years.
