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Paracheirodon simulans, also known as the Green Neon Tetra, is a small South American characid valued for its glowing blue-green stripe and peaceful nature. It naturally inhabits the soft, acidic waters of the Rio Negro basin, where it moves in tight schools among roots and submerged vegetation. Its modest size, calm temperament, and vivid coloration make it an excellent choice for a well-planted community aquarium. This species is common in the aquarium trade, but wild-collected specimens benefit from careful acclimation and quarantine.

General species description

Paracheirodon simulans is a small schooling fish belonging to the family Characidae. It should ideally be kept in a group of at least eight to ten individuals, since schooling reduces stress and highlights its coordinated swimming. Its slender body is suited to calm areas where it can move among plants, roots, and leaf litter. The species is generally peaceful with similarly sized tank mates, although it may become intimidated by much larger or highly active fish. Stable, soft, slightly acidic water supports its coloration and natural behavior. The specimens offered here are wild collected, making quarantine and gradual acclimation especially important.

Geographic origin and biotope

Paracheirodon simulans comes from the Rio Negro basin in northwestern Amazonia, including the Colombian region associated with the Guainía and Atabapo drainages. It inhabits small forest streams, slow tributaries, and marginal areas where the water is often stained by tannins. The habitat is usually shaded by forest, with roots, submerged branches, and leaf litter providing cover. The water is generally very soft and acidic, sometimes dark and low in dissolved minerals. In an aquarium, floating plants, subdued lighting, and a few roots help recreate this environment without making maintenance difficult.

Precise locality and local name

In aquarium references, the species is chiefly associated with the Rio Negro and its tributaries in the northwestern Amazon, particularly the Guainía and Atabapo waters of Colombia. The English name Green Neon Tetra is widely used in the international trade. In French, it is commonly called néon vert or tétra néon vert; in Spanish, néon verde. These names refer to the iridescent stripe running along the flank. Because several small Amazonian characids have similar trade names, identification by the scientific name remains the most reliable way to avoid confusion.

Appearance and physical characteristics

The body of Paracheirodon simulans is slender, elongated, and slightly compressed from side to side. A metallic blue-green stripe extends from the head to the base of the caudal fin and shows especially well under gentle lighting. A red line is also present on the rear portion of the flank, but it is usually shorter and less dominant than in the cardinal tetra. The fins are translucent, while the back is grayish silver to olive. Adult size remains small, at about 2.5 cm, which explains its popularity in planted nano and community aquariums. Mature females are often deeper-bodied, while males are generally slimmer.

General diet

In nature, Paracheirodon simulans feeds on tiny aquatic and terrestrial prey, including microcrustaceans, larvae, and other very small organisms. In aquariums, it accepts a varied diet of quality micro-pellets, finely crushed flakes, and frozen foods such as baby brine shrimp or daphnia. Portions should be small because its mouth and digestive tract are adapted to modest, repeated meals. Feeding small amounts once or twice daily helps reduce waste and maintain good condition. A varied diet generally enhances coloration and supports the vitality of wild-collected fish after acclimation.

Essential data

• Native river: Rio Negro
• Local name used: Néon verde; Green Neon Tetra
• Origin of the scientific name: The name was assigned by ichthyologist Jacques Géry.
• Etymology of the full name: Paracheirodon means close to Cheirodon; simulans means resembling or imitating.
• Common/vernacular names: Green Neon Tetra, Green Neon
• Family: Characidae
• Subfamily: Stethaprioninae
• Name pronunciation: par-ah-KAI-ro-don sim-you-lanz
• Discovery: Jacques Géry, 1963
• Maximum adult size: About 2.5 cm
• Water temperature and pH: 24 to 30 °C; pH 4.5 to 7.0
• Stream appearance and surrounding vegetation: Shaded forest streams, often tannin-stained, with roots, branches, and submerged leaf litter.
• Typical tank mates: Paracheirodon axelrodi, Paracheirodon innesi, small Corydoras, small pencilfish, and peaceful adult shrimp.
• Temperament and behavior: Peaceful, social, and active in a school; keep at least eight to ten individuals.
• Water depth: Shallow to moderately deep areas near banks and vegetation.
• Sexual dimorphism: Females are usually rounder; males are slimmer, especially when mature.
• Bottom structure and flow: Leaf litter, sand, and plant debris; low to moderate current.
• Rarity: Common in the aquarium hobby.
• Status of the specimens presented: Wild-collected species.

For greater success

To keep Paracheirodon simulans successfully, use a mature, covered aquarium with dense planting and lighting softened by floating plants. A group of at least eight to ten fish, clean water, and stable parameters matter more than very strong filtration. Wild specimens should be acclimated slowly, with particular attention to temperature and water quality. Offer small varied meals and avoid oversized or aggressive tank mates. With a calm setting, natural shelters, and soft water, this small tetra displays its full blue-green coloration and schooling behavior.