Discus tank mates
Advanced keeper's fish. A discus group in a well-run soft-water tank rewards the effort, but discus do not forgive casual maintenance or impulse stocking.
Lists below are built from this species record (safest, best with, risky, unsafe) — each link opens a pair-level check, not a guarantee.
Best tank mates (on file)
Merged from conservative safest and best with fields — de-duplicated by species.
The Discus profile lists Cardinal Tetra as both safe and a recommended pairing. Cardinal Tetra schools in groups of 6 or more, so plan room for the whole group rather than one fish. Water parameters barely overlap between the two, so check the temperature and pH ranges on both profiles before stocking.
The Discus profile lists Corydoras Catfish as both safe and a recommended pairing. Corydoras Catfish schools in groups of 6 or more, so plan room for the whole group rather than one fish. Water parameters barely overlap between the two, so check the temperature and pH ranges on both profiles before stocking. Corydoras Catfish swims in the bottom zone while Discus stays in the middle, so the two will not crowd the same water column.
The Discus profile lists German Blue Ram as both safe and a recommended pairing. German Blue Ram is a peaceful intermediate-care species with a 80L minimum. Run the pair checker for your specific tank before stocking.
The Discus profile lists Rummy Nose Tetra as both safe and a recommended pairing. Rummy Nose Tetra schools in groups of 8 or more, so plan room for the whole group rather than one fish. Water parameters barely overlap between the two, so check the temperature and pH ranges on both profiles before stocking.
Risky or situational
From risky tank mates and broad avoid with (excluding “unsafe” below). May work with species-only setups, more water, or mature systems — read the pair page.
None on file beyond the safe list.
Fish to avoid with Discus
From the unsafe list — predation, aggression, or space rules on this profile.
Tiger Barb conflicts with Discus on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Oscar is rated aggressive and Discus is rated peaceful. No community-style planning carries that gap.
Jack Dempsey is rated aggressive and Discus is rated peaceful. No community-style planning carries that gap.
Zebra Danio conflicts with Discus on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Tank size and groups
- Published minimum for Discus: 200L — group minimum 4 .
- Compatibility changes when the tank is too short for turning, too little for a real school, or too warm for one species and not the other — that is why pair checks include tank context, not only temperament.
- Nearest litre hub to this minimum: 200L hub.
Easier alternatives to consider
Conservative beginner-peaceful picks from the library — not replacements for reading, but a shorter on-ramp than this species for a first tank.
Plan before you buy
Pair checks for every mix, then multi-species stocking in the builder.
Filtration & heating
A 200L minimum tank for Discus needs a filter rated for at least 800L/hr turnover and a heater maintaining 28–32°C.
Similar fish (same category)
- African Cichlid — min 200L
- Convict cichlid — min 200L
- Firemouth Cichlid — min 200L
- Jack Dempsey — min 200L
- Keyhole cichlid — min 200L
- Rainbow cichlid — min 200L
- Angelfish — min 150L
- Electric Blue Acara — min 150L
Related (care + temperament)
Other species that list Discus
Reverse lookup: these profiles reference Discus under safe or “best with” lists.