Altum Angelfish tank mates
Pterophyllum altum
4 rated pairings from the Altum Angelfish care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Altum Angelfish needs at least 55 gallons on its own; every companion adds to that.
Excellent matches
1 · Same water, complementary zones, no conflict.
Good matches
3 · Compatible with normal care — watch space and numbers.
Cardinal Tetra
Paracheirodon axelrodi
15 gal min · 2" adult · Peaceful
Small, peaceful schooling fish that thrive in soft acidic water; avoid fin-nipping and occupy lower water column
Otocinclus
Otocinclus vittatus
10 gal min · 1.5" adult · Peaceful
Peaceful algae eaters compatible with blackwater conditions; occupy bottom zone without competing with altums
Black Phantom Tetra
Megalamphodus megalopterus
15 gal min · 1.75" adult · Peaceful
Small, soft-water tetra that schools peacefully; non-aggressive and compatible with acidic conditions
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.