Neon Tetra and Cardinal Tetra Compatibility
Neon Tetra and Cardinal Tetra make a good match: temperature ranges overlap at 73–79°F, water chemistry aligns, and neither presents a meaningful behavioural or size risk. Plan on at least 20 gallons. Individual fish vary — observe behaviour during introduction.
Neon Tetra vs Cardinal Tetra at a glance
| Aspect | Neon Tetra | Cardinal Tetra |
|---|---|---|
| Adult size | ~1.2 in | ~2 in |
| Minimum tank | 10 gal | 20 gal |
| Temperature | 70–79°F | 73–82°F |
| pH | 5.5–7 | 5–7 |
| Temperament | peaceful | peaceful |
| Swimming zone | middle | middle |
| Group size | 6+ | 6+ |
| Care level | easy | moderate |
Overlap in temperature: 73–79°F. Overlap in pH: 5.5–7.
Why this verdict
- Temperature: Shared range of 73–79°F.
- Water parameters: Shared pH range of 5.5–7.
- Temperament: Both species are peaceful community fish.
- Adult size: Comparable adult sizes (~1.2" and ~2").
- Swimming zone: Both are middle-dwelling, but peaceful — sharing the layer is fine with cover.
- Schooling: Group sizes matter: Neon Tetra: keep at least 6; Cardinal Tetra: keep at least 6.
- Tank size: Plan for at least 20 gallons to satisfy both species.
Main risks
No standout risks — a peaceful pairing that works in a settled community tank.
Recommended tank
Plan on 20 gallons or larger for this pair. Suitable sizes: 20 gallon High, 20 gallon Long, 29 gallon.
Group sizes: Neon Tetra: keep at least 6; Cardinal Tetra: keep at least 6.
Sources
- FishBase — Scientific Database · Primary / scientific · https://www.fishbase.se/
- SeriouslyFish — Specialist Publication · High authority · https://www.seriouslyfish.com/
- Aquarium Forge editorial guidelines — Editorial Interpretation · Editorial interpretation
- FishBase — Scientific Database · Primary / scientific · https://www.fishbase.se/
- SeriouslyFish — Specialist Publication · High authority · https://www.seriouslyfish.com/
- Aquarium Forge editorial guidelines — Editorial Interpretation · Editorial interpretation
- Aquarium Forge editorial guidelines — Editorial Interpretation · Editorial interpretation
Compatibility verdicts are planning guidance, not guarantees — individual fish vary. Rule version 1.1 · Data reviewed: .
Frequently asked questions
Can Neon Tetra and Cardinal Tetra live together?
Our verdict is “Good Match”. Neon Tetra and Cardinal Tetra make a good match: temperature ranges overlap at 73–79°F, water chemistry aligns, and neither presents a meaningful behavioural or size risk. Plan on at least 20 gallons. Individual fish vary — observe behaviour during introduction.
What tank size do Neon Tetra and Cardinal Tetra need?
Plan for at least 20 gallons so both species have their minimum space — Neon Tetra needs 10+ gal and Cardinal Tetra needs 20+ gal. Adding length and cover reduces stress further.
What temperature do Neon Tetra and Cardinal Tetra share?
Their comfortable ranges overlap at 73–79°F. Hold the tank near the middle of that band and avoid the extremes of either species' range.
What are the main risks keeping Neon Tetra with Cardinal Tetra?
There are no standout behavioural or size risks — the usual care and a settled, well-filtered tank is enough.
How many Neon Tetra and Cardinal Tetra should I keep?
Neon Tetra: keep at least 6; Cardinal Tetra: keep at least 6. Group sizes matter for shoaling fish — too few and they become stressed and nippy.
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