TankStocking

Can Betta (Siamese Fighting Fish) live with Neon Tetra?

Can sometimes work, with care — Betta (Siamese Fighting Fish) and Neon Tetra can share a tank, but only if the conditions below are met.

By the TankStocking team · methodology-driven, sourced from aquarium care references Data v2026.06 · last reviewed How we judge this →

The planner's verdict

Betta (Siamese Fighting Fish) + Neon Tetra

! Worth a closer look

1× Betta (Siamese Fighting Fish), 6× Neon Tetra

Possible with care — read the flagged conditions below before committing.

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Betta (Siamese Fighting Fish) vs Neon Tetra: key facts

A neutral, side-by-side look at each species' sourced stats. These are figures only — the verdict above states whether they should share a tank.

Key facts side by side — Betta (Siamese Fighting Fish) vs Neon Tetra (sourced stats only)
Key factBetta (Siamese Fighting Fish)Neon Tetra
Adult size6.5 cm3 cm
Minimum tank5 US gal10 US gal
Minimum group1 (keep singly)6+ (shoal)
TemperamentTerritorialPeaceful
Temperature range24–28°C21–25°C
pH range6–7.55–7.5
BioloadLowLow
Swim levelAll levelsMidwater
Beginner-friendlyYesYes

Why, at a glance

Drawn straight from the sourced figures above, using the same thresholds the engine applies — these show the data behind the verdict, not a separate opinion.

Temperature range overlap — Betta (Siamese Fighting Fish) vs Neon Tetra Shared temperature window: 24–25°C (1°C overlap). Both ranges include it. Betta (Siamese Fighting Fish): 24–28°C Neon Tetra: 21–25°C shared 14°C32°C
Temperature range overlap. Shared temperature window: 24–25°C (1°C overlap). Both ranges include it.
pH range overlap — Betta (Siamese Fighting Fish) vs Neon Tetra Shared pH range: 6–7.5. Both prefer water within it. Betta (Siamese Fighting Fish): 6–7.5 Neon Tetra: 5–7.5 shared 58.5
pH range overlap. Shared pH range: 6–7.5. Both prefer water within it.
Adult size to scale — Betta (Siamese Fighting Fish) vs Neon Tetra Betta (Siamese Fighting Fish) (6.5 cm) is 2.2× the length of Neon Tetra (3 cm) — under the 3.5× size gap that flags predation risk. Betta (Siamese Fighting Fish): 6.5 cm Neon Tetra: 3 cm 10.5 cm = 3.5× line 0 cm
Adult size to scale. Betta (Siamese Fighting Fish) (6.5 cm) is 2.2× the length of Neon Tetra (3 cm) — under the 3.5× size gap that flags predation risk.
Sources & confidence (2 species)

These back the Betta (Siamese Fighting Fish) and Neon Tetra figures used for this verdict. Each figure is read from the TankStocking species database (v2026.06); below is the care reference behind it and how confident we are in that data. Confidence reflects the source quality, not whether any pairing is safe. Full source list and the welfare model are on the methodology page.

  • Betta (Siamese Fighting Fish) Betta splendens — Seriously Fish (seriouslyfish.com/species/betta-splendens) high confidence
  • Neon Tetra Paracheirodon innesi — Seriously Fish (seriouslyfish.com/species/paracheirodon-innesi) high confidence

Why

  • Betta (Siamese Fighting Fish) can be territorial — give broken sightlines and space, and watch for bullying.
If you try it: use at least 20 US gallons (76 L), with just one Betta (Siamese Fighting Fish) and a group of 6+ Neon Tetra, in a cycled, planted tank — and only if every condition above is met. Watch closely and be ready to separate them.

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      Verdict

      Safer matches for Betta (Siamese Fighting Fish)

      Other species the engine clears with Betta (Siamese Fighting Fish) — tap to load the pairing.

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      Common questions

      Can Betta (Siamese Fighting Fish) live with Neon Tetra?

      Can sometimes work, with care — Betta (Siamese Fighting Fish) and Neon Tetra can share a tank, but only if the conditions below are met. TankStocking's engine reaches this by checking minimum tank size, group needs, temperature overlap, aggression, predation by size and fin-nipping for this exact pairing.

      What tank size do Betta (Siamese Fighting Fish) and Neon Tetra need together?

      Plan for at least 20 US gallons so both species clear their minimum-tank needs, with just one Betta (Siamese Fighting Fish) and a group of 6+ Neon Tetra. More water and a planted layout with broken sightlines always help.

      Related to Betta (Siamese Fighting Fish) & Neon Tetra

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      This is a planning estimate based on sourced species data — individual fish vary. See the methodology, the Betta (Siamese Fighting Fish) tank mates guide, or the full fish list.