Congo Tetra tank mates
Large tetra at 8 cm with iridescent flanks and flowing fins on males. Needs a long tank with low flow and soft water. Males are spectacular in a mature school.
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 Congo Tetra profile lists Boesemani Rainbowfish as both safe and a recommended pairing. Boesemani Rainbowfish schools in groups of 6 or more, so plan room for the whole group rather than one fish.
The Congo Tetra profile lists Bolivian Ram as both safe and a recommended pairing. Bolivian Ram is a peaceful intermediate-care species with a 110L minimum. Run the pair checker for your specific tank before stocking.
The Congo Tetra 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. Corydoras Catfish swims in the bottom zone while Congo Tetra stays in the middle, so the two will not crowd the same water column.
The Congo Tetra profile lists Dwarf Neon Rainbowfish as both safe and a recommended pairing. Dwarf Neon Rainbowfish schools in groups of 8 or more, so plan room for the whole group rather than one fish.
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 Congo Tetra
From the unsafe list — predation, aggression, or space rules on this profile.
Tiger Barb conflicts with Congo Tetra on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Serpae Tetra conflicts with Congo Tetra on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Oscar reaches 35cm and is flagged predatory. Congo Tetra at 8cm is prey-sized for it. Oscar is rated aggressive and Congo Tetra is rated peaceful. No community-style planning carries that gap.
Jack Dempsey reaches 25cm and is flagged predatory. Congo Tetra at 8cm is prey-sized for it. Jack Dempsey is rated aggressive and Congo Tetra is rated peaceful. No community-style planning carries that gap.
Tank size and groups
- Published minimum for Congo Tetra: 180L — group minimum 8 (schooling).
- 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 180L minimum tank for Congo Tetra needs a filter rated for at least 720L/hr turnover and a heater maintaining 23–28°C.
Similar fish (same category)
- Diamond Tetra — min 120L
- Serpae Tetra — min 100L
- Black phantom tetra — min 80L
- Columbian Tetra — min 80L
- Penguin tetra — min 80L
- Rosy Tetra — min 80L
- Rummy Nose Tetra — min 80L
- Splash tetra — min 80L
Other species that list Congo Tetra
Reverse lookup: these profiles reference Congo Tetra under safe or “best with” lists.