Green Neon Tetra (Paracheirodon simulans) Aquarium Glaser

Green Neon Tetra (Paracheirodon simulans)

The Green Neon Tetra is a small, schooling South American tetra prized for its subtle, glowing emerald-blue stripe and peaceful nature. It is closely related to the Neon Tetra (P. innesi) but prefers warmer, softer water and remains slightly smaller.

Quick Facts

• Scientific name: Paracheirodon simulans
• Common name: Green Neon Tetra
• Adult size: ~2.5 cm (1 inch)
• Lifespan: 3–5 years (often longer in optimal conditions)
• Temperament: Peaceful, schooling
• Care level: Intermediate
• Origin: Upper Amazon Basin (Brazil, Colombia)

Appearance

• Narrow body with an intense greenish-blue iridescent stripe
• Minimal red coloration compared to Neon or Cardinal Tetras
• Color intensity increases under low lighting and dark substrates
• Smaller and slimmer than Neons (P. innesi)

Tank Requirements

Minimum tank size

• 10 gallons (40 L) for a proper school
• Larger tanks strongly recommended for stability

Water parameters

• Temperature: 25–30 °C (77–86 °F) ❗ warmer than Neons
• pH: 4.5–6.5 (acidic)
• Hardness: Very soft (0–4 dGH)
• Flow: Gentle
• Water quality: Extremely clean; sensitive to ammonia/nitrite

These fish thrive in blackwater-style aquariums.

Aquascaping

Best replicated with:

• Dark substrate (sand or fine gravel)
• Driftwood and leaf litter (Indian almond, oak)
• Dense live plants (Cryptocoryne, Amazon swords, mosses)
• Dim lighting or floating plants

A natural, shaded environment greatly improves coloration and confidence.

Social Behavior

• Must be kept in groups of at least 8–10
• Larger schools = better color and lower stress
• Non-aggressive and shy when kept in small numbers

Good tankmates

• Other small, peaceful fish from soft acidic water
  • Ember Tetras
  • Pencilfish
  • Dwarf Corydoras
  • Apistogramma (with care)
• Avoid large or boisterous species

Diet

Omnivore, prefers small foods:

Staple foods

• High-quality micro pellets or flakes

Supplement with

• Baby brine shrimp
• Daphnia
• Cyclops
• Microworms

Feed small amounts 1–2 times daily. Variety enhances color and health.

Breeding (Advanced)

Green Neons are harder to breed than standard Neons.

Key points

• Requires very soft, acidic water (pH ~4.5–5.0)
• Low light or near darkness
• Eggs are light-sensitive
• Adults must be removed after spawning

Most commercially available specimens are wild-caught or farm-raised under controlled conditions.

Common Issues

• Sensitive to poor water quality
• Prone to stress in new or brightly lit tanks
• Not ideal for brand-new aquariums
• Acclimate slowly (drip acclimation recommended)

Green Neon vs Neon Tetra

Green Neon Tetra is a stunning but slightly more demanding species than the standard Neon Tetra. In a warm, soft, well-maintained aquarium with a proper school, they reward keepers with shimmering, jewel-like coloration and calm, natural behavior.