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Compatibility

Compatibility brief

Can Guppy live with Neon Tetra?

Guppy

Guppy

Poecilia reticulata

peaceful~5cm
Neon Tetra

Neon Tetra

Paracheirodon innesi

peaceful~4cm
VerdictCAUTION

Caution. Check the issues below before buying.

Guppy + Neon Tetra: Caution advised. Classic community pairing, both small and peaceful, often mixed in planted tanks. Aim mid-range temperature so neither species sits at the edge of tolerance.

Compatibility score

72/100

Profile confidence: medium

Order of checkstank volume vs adults → predation mouth gap → temperament / fin nipping → shared water windows.

Min tank

40L

Combined minimum footprint reference for these two species: about 40L (larger active fish often want more length).

Temperature
Range in °C22–26°C shared
GuppyNeon TetraShared window
pH
Range6.8–7 shared
GuppyNeon TetraShared window
Temperament / behaviour

Both species are small and often mixed in shops, but their ideal pH windows only overlap narrowly. The live verdict is CAUTION because that water compromise needs active management, not because the fish are aggressive toward each other. Keepers who aim for a stable mid-range pH and avoid chasing either species to its extreme usually do better than those who treat the pairing as automatic.

Assessment details

  1. Caution advised

    Top issue

    Classic community pairing, both small and peaceful, often mixed in planted tanks. Aim mid-range temperature so neither species sits at the edge of tolerance.

  2. Compatible temperaments

    Both Guppy and Neon Tetra share a peaceful temperament.

  3. Compatible temperature range

    Both fish can comfortably share similar water temperatures.

  4. Narrow pH overlap

    These fish can share water but their ideal pH ranges overlap only slightly. Aim to keep pH stable in the shared range.

“Classic community pairing, both small and peaceful, often…”

Caution advised

Next steps

Concrete changes, not "research more" filler.

  • •Hold pH in the shared band and avoid large swings. Give neons a real school and guppies enough surface grazing so neither group looks stressed while you tune water.
  • •Neon Tetra should be kept in a group of at least 6 for best health and behaviour.
Sources from both profiles
Only URLs that exist on the species records are shown. We do not fabricate citations.

Try this next

Build the full stocking list with Guppy + Neon Tetra

Compare another pairOpen tank builder

Plan further

Check each species’ mates list, size the glass, then verify the full stock in the builder. Methodology explains how verdicts are produced.

Individual fish vary in personality. Fishori uses conservative hobby rules. Observe any new introduction closely, feed thoughtfully, and keep a quarantine or backup plan. This is not veterinary advice.

Profile data confidence: high. Checked against several solid care sources that mostly agree.

Full tank-mate guides

Related pair checks

Other tank mates for Guppy

Guppy + Neon Tetra — common questions

Can Guppy live with Neon Tetra?
Yes, if you plan for it. Fishori’s live verdict is CAUTION because the pH overlap is narrow even though temperament is peaceful. Keep water stable in the shared range and watch both schools for stress — do not treat a curated “classic community” label as a guarantee.
What tank size do you need for Guppy and Neon Tetra together?
Plan around 40 litres as the working minimum. That figure comes from each species' published minimum and their group needs, and it assumes adult sizes, not shop sizes.
What's the main risk?
Narrow pH overlap. That is the first thing to plan around. The matching entry under assessment details on this page explains the reasoning and the numbers behind it.
What should you check before buying?
Neon Tetra should be kept in a group of at least 6 for best health and behaviour.