Species Profile
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Altum Angelfish

Accuracy: Verified
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This profile has completed research review. Source-backed care information is shown below. Final publication checks are still pending.
Species profile

Altum Angelfish

Pterophyllum altum
Semi aggressive Hard care 350 L minimum aquarium 12–18 cm adult size Mid–top Minimum group: 5

About this species

General notes for hobby use.

Very tall, soft-water angelfish requiring a deep aquarium, excellent water quality and warm, acidic conditions.

Water parameters

Suggested general range for long-term care.

Temperature 27–31 °C
pH 4.8–6.2
GH 1–5 dGH
KH Not yet documented
Flow preference Low–moderate
Data confidence Verified

Behaviour

General behaviour traits used by TanksConnected compatibility checks.

Minimum group size Minimum group: 5
Tank zone Mid–top
Territory level Moderate
Predation risk Small fish
Bioload factor 2.8
Best maintained in a compatible group in a tall, spacious aquarium; spawning pairs defend a territory.

Compatibility flags

Quick cautions for common tank-planning issues.

Fin nipper No
Plant safe Yes
Shrimp safe No / caution
Snail safe Yes
Cave breeder No
Digs substrate No
Jump risk Yes

Natural history & care

Research-backed context for long-term aquarium care.

Lifespan Not yet documented
Diet type Omnivore
Minimum aquarium volume 350 L
Minimum footprint 150 × 50 cm
Accepted scientific name Pterophyllum altum
Alternative names Altum Angel, Orinoco Altum Angelfish
Native range
Upper Orinoco and upper Rio Negro systems in Venezuela and Colombia.
Natural habitat
Blackwater and clearwater tributaries with very soft acidic water, submerged wood, roots and vertical structure.
Diet & feeding
Predominantly takes small aquatic invertebrates and other animal foods; captive diets should remain varied and high quality.

Breeding & sexing

Research-backed guidance for identifying sexes and reproductive behaviour.

Sexing
Sexual dimorphism is weak; confirmed breeding behaviour and genital papilla are the safest indicators.
Breeding
Pair-forming substrate spawner using vertical surfaces; successful captive breeding is much less routine than with domestic P. scalare.