Porthole Catfish tank mates
Dianema longibarbis
3 rated pairings from the Porthole Catfish care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Porthole Catfish needs at least 30 gallons on its own; every companion adds to that.
Excellent matches
2 · Same water, complementary zones, no conflict.
Cardinal Tetra
Paracheirodon axelrodi
15 gal min · 2" adult · Peaceful
Similar soft, acidic water requirements and completely peaceful; an ideal pairing in a biotope-style Amazon setup.
Harlequin Rasbora
Trigonostigma heteromorpha
10 gal min · 2" adult · Peaceful
Peaceful mid-water schooling fish with overlapping water parameter preferences; adds activity to upper zones without disturbing the catfish.
Good matches
1 · Compatible with normal care — watch space and numbers.Also recommended alongside Porthole Catfish
Species whose own guides list Porthole Catfish as a tank mate.
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.