What fish can live with Discus?

This hub has no “usually safer” (GOOD) companions for Discus. Workable neighbours sit in caution — for example German Blue Ram, Zebra Danio. Treat every name as a pair check, not a shopping list. Discus tank mates are a soft-water, warm-water, ultra-clean club — and the live engine marks no GOOD companions on this hub.

What tank mates should you avoid with Discus?

Avoid Jack Dempsey, Oscar, Tiger Barb based on size, temperament, or predation risk on this profile.

What size tank do Discus need for a community?

250 L or more for five or six fish (they do not pair off well in small numbers). 50 cm or more tank height matters.

Discus tank mates

Discus tank mates are a soft-water, warm-water, ultra-clean club — and the live engine marks no GOOD companions on this hub. German blue rams, rummy-nose tetras, and zebra danios sit in caution as situational dither only when chemistry and temperature stay honest. Cardinal tetras, corydoras, Jack Dempseys, oscars, and tiger barbs are avoid. Most ‘community discus’ advice fails because the discus needs were compromised first. If you will not hold stable soft water near 28–30°C, do not shop for tank mates — shop for a different centrepiece.

Common mistakeRunning large water changes with temperature-mismatched water is the classic discus wipeout. A few degrees colder on a big change triggers disease in otherwise healthy fish. Match temperature and chemistry on every change, and do not start discus on hard tap water you will not soften.

Evidence: verified

Confidence: high

Each name below opens a pair check with Discus. That check is the decision, not the list itself.

← Full Discus profile·Compatibility checker·Tank builder·More cichlid

Usually safer companions

Conservative shortlist from this profile. Open a pair page before you buy.

None listed here. Use the pair checker with species you are considering.

Risky or situational

May work with more water, a mature system, or a species-only setup. Read the pair page before you experiment.

German Blue Ram Open pair check
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Zebra Danio Open pair check
Temperature ranges barely overlap between the two, so one species ends up living at the edge of its comfort window. Run the pair checker before stocking.

Fish to avoid with Discus

Predation, aggression, or space rules on this profile. Treat these as poor default mixes.

Jack Dempsey See why (pair)
Jack Dempsey is rated aggressive and Discus is rated peaceful. No community-style planning carries that gap.
Oscar See why (pair)
Oscar is rated aggressive and Discus is rated peaceful. No community-style planning carries that gap.
Tiger Barb See why (pair)
Tiger Barb 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

Hardier first-tank names from the library. Still read the profile. Not a substitute for reading this one.

Plan before you buy

Start a pair check with Discus, or open a starter plan with the top safer companions in the builder.

Open pair checker Open this plan in builder

Tank hubs: 200L

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.

Filter size guide →Heater size guide →Tank setup checklist →Beginner plants guide →

Related (care + temperament)

Other species that list Discus

Reverse lookup: these profiles reference Discus under safe or “best with” lists.

Sterba's Corydoras tank mates

Featured compatibility checks

Curated pair pages for Discus. Each opens a full verdict — not just a list label.