Compatibility brief
Can Cardinal Tetra live with Discus?
Risky. This mix is commonly discouraged for typical setups.
Cardinal Tetra + Discus: Incompatible temperature requirements. Cardinal Tetra needs 23–27°C and Discus needs 28–32°C. Their ranges do not overlap. Real tanks add variables Fishori cannot model; treat this as a high-risk read, not certainty.
Compatibility score
Profile confidence: medium
Order of checkstank volume vs adults → predation mouth gap → temperament / fin nipping → shared water windows.
200L
Combined minimum footprint reference for these two species: about 200L (larger active fish often want more length).
Assessment details
Compatible temperaments
Both Cardinal Tetra and Discus share a peaceful temperament.
Incompatible temperature requirements
Top issueCardinal Tetra needs 23–27°C and Discus needs 28–32°C. Their ranges do not overlap.
“Cardinal Tetra needs 23–27°C and Discus needs 28–32°C”
Incompatible temperature requirements
Next steps
Concrete changes, not "research more" filler.
- •Cardinal Tetra should be kept in a group of at least 6 for best health and behaviour.
- •Discus should be kept in a group of at least 4 for best health and behaviour.
- •These fish cannot be comfortably housed together. Their temperature needs are incompatible.
Try instead
- →Cardinal Tetra should be kept in a group of at least 6 for best health and behaviour.
- →Discus should be kept in a group of at least 4 for best health and behaviour.
- →These fish cannot be comfortably housed together. Their temperature needs are incompatible.
- Seriously Fish. Paracheirodon axelrodi
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Paracheirodon axelrodi
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Paracheirodon axelrodi
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
- Wikipedia. Paracheirodon axelrodi (cardinal tetra)
Encyclopaedia overview; use specialist aquarium sources for your stock's real temperature/pH/footprint needs.
- Seriously Fish. Symphysodon aequifasciatus (discus complex representative)
Primary stand-in: Seriously Fish page for a common discus taxon. Trade 'discus' is often a mix of lineages, strains, and hybrids. Match your bag label, not a single name field here.
- FishBase. Symphysodon aequifasciatus
Taxonomy, distribution, and typical max length in natural/wild contexts (cross-check to aquarium import lines).
- Wikipedia. Discus (fish)
Encyclopaedia overview; use specialist aquarium sources for your stock's real temperature/pH/footprint needs.
Try this next
Build the full stocking list with Cardinal Tetra + Discus
Plan further
Try both species in the full-stock tank check, or open either fish profile for mates lists. Methodology explains how verdicts are produced.
Individual fish vary in personality. Fishori uses conservative hobby rules. Observe any new introduction closely, feed thoughtfully, and keep a quarantine or backup plan. This is not veterinary advice.
Profile data confidence: high. Based on multiple reputable aquarium care sources with strong agreement.