Discus tank mates
Symphysodon spp.
4 rated pairings from the Discus care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Discus needs at least 55 gallons on its own; every companion adds to that.
Excellent matches
1 · Same water, complementary zones, no conflict.
Good matches
2 · 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 warm, soft acidic water matching discus needs
Rummy Nose Tetra
Hemigrammus rhodostomus
15 gal min · 2" adult · Peaceful
Peaceful schooler with similar water parameter requirements and non-threatening behavior
Use caution
1 · Works in the right setup; read the note before combining.
Also recommended alongside Discus
Species whose own guides list Discus as a tank mate.
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.