TankStocking

Can Neon Tetra live with Guppy (Fancy)?

Yes — Neon Tetra and Guppy (Fancy) are a workable pairing in a suitable, cycled tank.

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

The planner's verdict

Neon Tetra + Guppy (Fancy)

✓ Good starter plan

6× Neon Tetra, 3× Guppy (Fancy)

The engine clears this pairing — a workable starting point in a cycled, planted tank.

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Neon Tetra vs Guppy (Fancy): 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 — Neon Tetra vs Guppy (Fancy) (sourced stats only)
Key factNeon TetraGuppy (Fancy)
Adult size3 cm5 cm
Minimum tank10 US gal10 US gal
Minimum group6+ (shoal)3+ (pair/group)
TemperamentPeacefulPeaceful
Temperature range21–25°C22–28°C
pH range5–7.57–8
BioloadLowLow
Swim levelMidwaterAll levels
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 — Neon Tetra vs Guppy (Fancy) Shared temperature window: 22–25°C (3°C overlap). Both ranges include it. Neon Tetra: 21–25°C Guppy (Fancy): 22–28°C shared 14°C32°C
Temperature range overlap. Shared temperature window: 22–25°C (3°C overlap). Both ranges include it.
pH range overlap — Neon Tetra vs Guppy (Fancy) Shared pH range: 7–7.5. Both prefer water within it. Neon Tetra: 5–7.5 Guppy (Fancy): 7–8 shared 58.5
pH range overlap. Shared pH range: 7–7.5. Both prefer water within it.
Adult size to scale — Neon Tetra vs Guppy (Fancy) Guppy (Fancy) (5 cm) is 1.7× the length of Neon Tetra (3 cm) — under the 3.5× size gap that flags predation risk. Neon Tetra: 3 cm Guppy (Fancy): 5 cm 10.5 cm = 3.5× line 0 cm
Adult size to scale. Guppy (Fancy) (5 cm) is 1.7× the length of Neon Tetra (3 cm) — under the 3.5× size gap that flags predation risk.
Sources & confidence (2 species)

These back the Neon Tetra and Guppy (Fancy) 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.

  • Neon Tetra Paracheirodon innesi — Seriously Fish (seriouslyfish.com/species/paracheirodon-innesi) high confidence
  • Guppy (Fancy) Poecilia reticulata — Aquarium Co-Op guppy care guide / FishBase Poecilia reticulata high confidence

Why

No welfare check fires for this pairing: their adult sizes, temperaments, temperature ranges and social needs line up. Keep each in its proper group and give the tank time to mature.

A workable setup: at least 20 US gallons (76 L), with a group of 6+ Neon Tetra and a group of 3+ Guppy (Fancy), in a cycled, planted tank. Test your exact plan below.

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      Verdict

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      Other species the engine clears with Neon Tetra — tap to load the pairing.

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      Common questions

      Can Neon Tetra live with Guppy (Fancy)?

      Yes — Neon Tetra and Guppy (Fancy) are a workable pairing in a suitable, cycled tank. 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 Neon Tetra and Guppy (Fancy) need together?

      Plan for at least 20 US gallons so both species clear their minimum-tank needs, with a group of 6+ Neon Tetra and a group of 3+ Guppy (Fancy). More water and a planted layout with broken sightlines always help.

      Related to Neon Tetra & Guppy (Fancy)

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      This is a planning estimate based on sourced species data — individual fish vary. See the methodology, the Neon Tetra tank mates guide, or the full fish list.