Green Neon Tetra

Paracheirodon simulans

Synonyms Green neon · Hyphessobrycon simulans

Green Neon Tetra (Paracheirodon simulans) is a peaceful freshwater fish that reaches about 2.5 cm (1 in) and swims in open water in a shoal. It wants 75–86°F (24–30°C) and pH 4.5–6.5, is kept in groups of 8 or more, and needs a tank of at least 40 L (11 gal).

At a glance

Type	Fish
Adult size	2.5 cm (1 in)
Minimum tank	40 L (11 gal)
Group size	8 or more
Temperature	75–86°F (24–30°C)
pH	4.5–6.5
Temperament	Peaceful
GH	1–5
Lifespan	2–3 years
Eats shrimp	Shrimplets only

Before it goes in

Green Neon Tetra needs at least 40 L (11 gal). The smallest size in this library that clears that is the 15 Gallon.
Keep 8 or more. Below that it hides, colours down and is far more likely to be picked on.
Adult shrimp are safe; shrimplets will be eaten, so a shrimp colony will not grow in the same tank.
It is the wrong size to share a tank with Goldfish, Angelfish and Axolotl: it ends up as food.
It holds at 75–86°F (24–30°C). That shares a window with Betta and Cherry Shrimp, but not with Goldfish and Dojo Loach.
Sources say not to put it in a newly set-up tank — give the tank a few months first.
A group of 8 takes up roughly 34% of what a 15 Gallon will comfortably hold, so plan the rest of the stock around it.

What tank size does it need?

At least 40 L (11 gal). The smallest size here that clears it is the 15 Gallon.

How many should I keep?

8 or more. Fewer than that and it spends its time hiding instead of out in the open.

Will it eat shrimp?

Adults are safe, shrimplets are not. You can keep shrimp with it; you just will not get a growing colony.

What water does it want?

75–86°F (24–30°C), pH 4.5–6.5, GH 1–5.

How long does it live?

2–3 years in a tank that suits it. That is how long you are signing up for.

Can it go in a new tank?

No. Sources say not to add it to a newly set-up tank — it wants a tank that has been running for months.

Good tank mates

Tank mates from this library that share its temperature window, are peaceful and eat neither it nor its young: Cherry Shrimp, Bristlenose Pleco, Celestial Pearl Danio, Molly and Otocinclus.
Plants that hold up with it: Hygrophila corymbosa 'Siamensis', Water Sprite, Anubias nana 'Petite' and Cryptocoryne wendtii.

Often compared with

	Green Neon Tetra	Neon Tetra	Cardinal Tetra
Adult size	2.5 cm	3.5 cm	5 cm
Min tank	40 L	40 L	60 L
Group	8+	6+	8+
Temperature	75–86°F (24–30°C)	70–81°F (21–27°C)	75–84°F (24–29°C)
Eats shrimp	Shrimplets only	Shrimplets only	Shrimplets only

More livestock

Plan a tank with Green Neon Tetra →

Sources (4) · checked Sep 2026