
Source: Wikimedia Commons
Paracheirodon simulans
Similar to neon tetra but blue-green line runs entire body. Ultra-small, most beautiful in large schools.
The green neon tetra (Paracheirodon simulans) is a small characin native to the blackwater rivers of the upper Orinoco and Negro River basins in South America — the same habitat as the cardinal tetra. The smallest of the three Paracheirodon species at 2–3 cm, it is distinguished by a more greenish-turquoise tint to its lateral blue stripe and a reduced area of red pigmentation compared to its relatives. It is the most demanding of the three to keep, requiring water conditions that closely replicate its acidic blackwater home: pH 4.5–6.5, very soft, with tannin supplementation via catappa leaves or driftwood for best coloration. Highly sensitive to water quality fluctuations, small but regular water changes are essential. Groups of ten or more form a shimmering turquoise-green school that catches light beautifully. Peaceful and compatible with other micro fish, they prefer appropriately small foods: fine granules, frozen daphnia, and baby brine shrimp. Less widely known than the neon tetra, green neon tetras are a premium choice for dedicated blackwater biotope aquariums.
Source: Wikipedia (CC BY-SA 4.0)
The Green Neon Tetra lives 2-4 years.
The Green Neon Tetra grows to 2-3cm.
The ideal temperature for the Green Neon Tetra is 24〜28℃.
Water temperature of 22–28°C is suitable.
Origin
Sources: FishBase / Seriously Fish
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Sources: FishBase / Seriously Fish / CITES Appendices (Checklist)
Regulations may change. Always verify the latest information with the relevant authorities.
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the upper Orinoco and Negro Rivers in South America
Lifespan
2-4 years
Size
2-3cm
Temperature
24〜28℃
Pellets, Frozen food
Ideal conditions are 24-28°C in very soft, acidic to slightly acidic water (pH 4.5-6.5). A tannin-stained blackwater setup suits it best.
Keep 10 or more to enjoy a beautiful turquoise-green school. Singles or small numbers stay nervous, so introduce them as a group.
Peaceful and compatible with most small fish. Choose tankmates with similar water requirements and avoid housing with large fish.
It favours fine granules, frozen daphnia and brine shrimp. The mouth is tiny, so offer finely sized food in small amounts.
Extremely sensitive to water changes, so do frequent small water changes rather than large ones.
More delicate than neon, sensitive to water
Beginner. This is a beginner-friendly species. No special equipment or experience is required, and it can be kept successfully with basic care setup.
The ideal temperature for Green Neon Tetra is 24〜28℃. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Green Neon Tetra is 2-4 years. With proper care and nutrition, they can live a long and healthy life.
Green Neon Tetra typically reaches 2-3cm as an adult. Size may vary depending on care conditions and individual genetics.
Green Neon Tetra feeds on: Pellets, Frozen food. Aim for a balanced diet with appropriate feeding frequency.
The price of Green Neon Tetra varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: June 24, 2026