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Altum angelfish (Pterophyllum altum)
AI illustration, not an ID reference

Altum angelfish

Pterophyllum altum

FishFreshwater

Care level
Demanding
Temperament
Semi-aggressive
Recommended tank
400 L
Maximum size
20 cm
Temperature
27–31 °C
pH
5–6.5
Group size
≥ 5
Diet
Carnivore

Care at a glance

The altum angelfish from the Orinoco and the upper Rio Negro is the tallest of the angelfish: adults are clearly taller than they are long, with a sharp notch above the eyes. The great majority of fish offered are wild caught, and that shows in their requirements.

It asks for warm, very soft and acidic water, a tall tank with vertical wood and absolute calm; large swings it tolerates badly. Count on a settling-in period in which it is prone to disease; this is a species for advanced keepers.

Good to know

  • Needs a mature, stable tank
  • Territorial
  • Outgrows most home tanks

Best not combined with

Related species

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Values are mainstream hobbyist guidance, not gospel — always watch what your own animals need.