Neon Tetra tank mates
Neon tetra compatibility has one rule that outranks every list on this page: nothing with a mouth big enough to fit a neon. That rule is why angelfish sit on the avoid list despite being sold as community fish in the same shop tank; an adult angel eats adult neons, and "they were raised together" does not change the outcome. Past the mouth-size test, neons are genuinely easy. They are peaceful, they hold the middle of the tank in a tight school, and they get along with almost anything calm that shares their preference for soft, slightly acidic, settled water. The word settled matters: neons added to a tank under a month old die in numbers no tank mate can be blamed for. Cycle first, stock the school of six or more, then build around them with small peaceful fish and bottom-dwellers.
Our first pick
Corydoras Catfish. The classic pairing for a reason: same soft-water preference, opposite tank zone, and no scenario where either species bothers the other. Run the pair check →
Common mistakeBuying three neons for a splash of colour is the stocking error that fades within a week. A weak school stresses the fish, breaks the shoal, and invites the disease problems people then blame on bad luck. Start with at least six — preferably eight to ten — in an established tank. Token numbers are a display idea, not a neon ownership plan.
Each name below opens a pair check with Neon Tetra. That check is the decision, not the list itself.
Usually safer companions
Conservative shortlist from this profile. Open a pair page before you buy.
The Neon Tetra profile lists Cherry Barb as both safe and a recommended pairing. Cherry Barb schools in groups of 6 or more, so plan room for the whole group rather than one fish.
The Neon 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 Neon Tetra stays in the middle, so the two will not crowd the same water column.
The Neon 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.
Risky or situational
May work with more water, a mature system, or a species-only setup. Read the pair page before you experiment.
Tiger Barb is rated semi-aggressive, so expect chasing, fin damage, or display behaviour directed at Neon Tetra. Run the pair checker before stocking.
Fish to avoid with Neon Tetra
Predation, aggression, or space rules on this profile. Treat these as poor default mixes.
Angelfish reaches 20cm and is flagged predatory. Neon Tetra at 4cm is prey-sized for it. Angelfish needs at least 150L, far above the 40L minimum for Neon Tetra. The tank that houses one stresses the other.
Jack Dempsey reaches 25cm and is flagged predatory. Neon Tetra at 4cm is prey-sized for it. Jack Dempsey needs at least 200L, far above the 40L minimum for Neon Tetra. The tank that houses one stresses the other. Jack Dempsey is rated aggressive and Neon Tetra is rated peaceful. No community-style planning carries that gap.
Oscar reaches 35cm and is flagged predatory. Neon Tetra at 4cm is prey-sized for it. Oscar needs at least 300L, far above the 40L minimum for Neon Tetra. The tank that houses one stresses the other. Oscar is rated aggressive and Neon Tetra is rated peaceful. No community-style planning carries that gap.
Tank size and groups
- Published minimum for Neon Tetra: 40L. Group minimum 6 (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: 40L hub.
Plan before you buy
Start a pair check with Neon Tetra, or open a starter plan with the top safer companions in the builder.
Tank hubs: 40L
Related reading
Guides that list other fish with the same trait, so you can plan around the group rather than one row.
- Schooling & group fish →
Plan the group of 6+ before choosing tank mates.
- Beginner-friendly freshwater fish →
Neon Tetra is on this list. Hardier options for a first stock.
- Peaceful community fish →
Other peaceful species to shortlist beside Neon Tetra.
Filtration & heating
A 40L minimum tank for Neon Tetra needs a filter rated for at least 160L/hr turnover and a heater maintaining 20–26°C.
Similar fish (same category)
- Ember Tetra · min 45L
- Beckford Pencilfish · min 60L
- Black Neon Tetra · min 60L
- Bloodfin tetra · min 60L
- Cardinal Tetra · min 60L
- Glowlight Tetra · min 60L
- Green neon tetra · min 60L
- Lemon Tetra · min 60L
Related (care + temperament)
Other species that list Neon Tetra
Reverse lookup: these profiles reference Neon Tetra under safe or “best with” lists.
Featured compatibility checks
Curated pair pages for Neon Tetra. Each opens a full verdict — not just a list label.
Neon Tetra tank mates — quick answers
- What fish can live with Neon Tetra?
- Usually safer companions on this hub include Cherry Barb, Corydoras Catfish, Harlequin Rasbora. Open each pair check before you buy — the list is a shortlist, not a guarantee.
- What tank mates should you avoid with Neon Tetra?
- Avoid Angelfish, Jack Dempsey, Oscar based on size, temperament, or predation risk on this profile.
- What size tank do Neon Tetra need for a community?
- 40 L is the working minimum; 60 L is the recommended long-term size. Neons swim laterally, so the school needs length more than depth to settle into proper schooling.