What fish can live with Columbian Tetra?

Use the "Often compatible" lists as a shortlist, not a stocking plan. Always run the pair tool and check the footprint of your actual tank first. Verify behaviour for Columbian Tetra against your own reading before you buy.

What tank mates should you avoid with Columbian Tetra?

Avoid Betta, Angelfish, Guppy based on size, temperament, or predation risk on file.

What size tank do Columbian Tetra need for a community?

80L is the planning floor for adult swimming space and bioload headroom. Long-term, a 100L+ tank lets adults use the full footprint without crowding the next species. Footprint, meaning length and front-to-back depth, matters as much as raw volume for active or territorial species.

Columbian Tetra tank mates

A robust steel-blue schooler that nips long fins. Stock eight, skip the bettas, and the school carries a planted 80L cleanly.

Evidence: partially verified

Confidence: medium

Lists below are built from this species record (safest, best with, risky, unsafe) — each link opens a pair-level check, not a guarantee.

← Full Columbian Tetra profile·Compatibility checker·Tank builder·More tetra

Best tank mates (on file)

Merged from conservative safest and best with fields — de-duplicated by species.

Bristlenose Pleco Pair check
The Columbian Tetra profile lists Bristlenose Pleco as both safe and a recommended pairing. Bristlenose Pleco grows bigger than Columbian Tetra (15cm vs 5cm). Stock the Columbian Tetra group large enough to outnumber the Bristlenose Pleco, or the smaller fish ends up bullied or off food. Bristlenose Pleco swims in the bottom zone while Columbian Tetra stays in the middle, so the two will not crowd the same water column.
Corydoras Catfish Pair check
The Columbian 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 Columbian Tetra stays in the middle, so the two will not crowd the same water column.
Harlequin Rasbora Pair check
The Columbian Tetra profile lists Harlequin Rasbora as both safe and a recommended pairing. Harlequin Rasbora schools in groups of 6 or more, so plan room for the whole group rather than one fish.
Otocinclus Pair check
The Columbian Tetra profile lists Otocinclus as both safe and a recommended pairing. Otocinclus schools in groups of 4 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.

Dwarf Gourami Open pair check
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.

Fish to avoid with Columbian Tetra

From the unsafe list — predation, aggression, or space rules on this profile.

Betta See why (pair)
Betta conflicts with Columbian Tetra on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Angelfish See why (pair)
Angelfish reaches 20cm and is flagged predatory. Columbian Tetra at 5cm is prey-sized for it.
Guppy See why (pair)
Guppy conflicts with Columbian Tetra 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 Columbian Tetra: 80L — 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: 80L hub.

Plan before you buy

Pair checks for every mix, then multi-species stocking in the builder.

Open compatibility checker Tank builder

Filtration & heating

A 80L minimum tank for Columbian Tetra needs a filter rated for at least 320L/hr turnover and a heater maintaining 22–28°C.

Filter buying guide →Heater buying guide →Beginner plants guide →