Pterophyllum altum
The altum angelfish is the largest and most deep-bodied Pterophyllum, native to blackwater tributaries of the upper Amazon. It is more demanding than common scalare: very soft, acidic water, high temperature, excellent water quality, and a very tall, wide aquarium with minimal current. Wild fish are seasonal imports; tank-raised altums are less common. Body profile is sharply notched (notched forehead), with longer fins than typical scalare. Not a beginner fish; best for dedicated South American biotope keepers.
High-quality frozen foods; live or frozen blackworm; varied diet; frequent small feeds during acclimation.
Frequency: 1–2× daily
Wild fish may need live foods at first; transition gradually to frozen.
Native Region: South America (upper Rio Negro, Orinoco—blackwater)
Deep, tannin-stained water with submerged branches and leaf litter.
Minimum tall tank (60+ cm water depth preferred); peat or RO blending common; very low nitrate.
Activity Level: Moderate
Sensitive to handling and water changes; dominant fish in soft-water setups.
Difficulty: Difficult
Type: Egg layer
Sexual Dimorphism: Similar to other Pterophyllum; tube shape at spawning; adults very deep-bodied.
Spawning in very soft, warm water; vertical surfaces; pairs need exceptional water and space.
Substrate: Sand
Plant Safe: Yes
Driftwood, leaf litter, dim lighting; avoid bright bare tanks.
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