Compatibility Overview
Neon Tetra and Oscar are generally not recommended to be housed together. The issues listed above — whether water parameter incompatibility, predation risk, or aggression — create conditions where one or both fish are likely to suffer harm or chronic stress.
| Factor | Neon Tetra | Oscar | Verdict |
|---|---|---|---|
| Temperature | 72–80°F | 74–81°F | ✅ 74–80°F |
| pH Range | 6.0–7.5 | 6.0–8.0 | ✅ 6.0–7.5 |
| Temperament | peaceful | aggressive | ❌ Risk |
| Adult Size | 1.5 in | 14 in | ❌ 9× difference |
| Min. Group | 6+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | — | |
✅ Compatibility Positives
❌ Incompatibility Reasons
Species Profiles
Neon Tetra — Paracheirodon innesi
Iconic schooling fish with vivid electric-blue and red stripes. Hardy in captivity; suitable for most peaceful community setups.
Oscar — Astronotus ocellatus
Intelligent but aggressive cichlids that will eat any fish small enough to fit in their mouth. Require large tanks (75+ gallons) and robust tank mates.
Frequently Asked Questions
Can Neon Tetra live with Oscar?
Generally not recommended. Neon Tetra and Oscar are generally not recommended to be housed together. The issues listed above — whether water parameter incompatibility, predation risk, or aggression — create conditions where one or both fish are likely to suffer harm or chronic stress.
What tank size do I need for Neon Tetra and Oscar together?
A minimum of 100 gallons is recommended for keeping Neon Tetra and Oscar together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Neon Tetra and Oscar?
74–80°F
Is a Neon Tetra aggressive toward a Oscar?
Neon Tetra is peaceful and Oscar is aggressive. Oscars will eat neon tetras.