Neon Tetra Care Guide

Neon tetras are obligate schooling fish. In the wild, they swim in groups of hundreds. Keeping them in small numbers causes chronic stress, which weakens their immune system and shortens their lifespan.

While neon tetras are small (1.5 inches), they need space to school. A tank that's too small restricts their natural behavior and leads to stress and aggression.

Recommended Sizes

• Minimum: 10 gallons for a school of 6
• Recommended: 20 gallons for a school of 10-15
• Ideal: 29+ gallons for 20+ tetras with tank mates
• Tank shape: Longer tanks work better than tall ones since tetras swim horizontally

Setup Requirements

• Plants: Dense planting provides security (java fern, amazon sword, floating plants)
• Lighting: Subdued (bright lights wash out their colors)
• Substrate: Dark substrate makes their colors pop
• Flow: Gentle to moderate since they're not strong swimmers
• Hiding spots: Driftwood and plants for retreating

Soft Water is Key

Neon tetras come from blackwater streams in South America with very soft, acidic water. While they can adapt to harder water, they truly thrive in soft water (1-2 dGH). If your tap water is hard, consider using RO/DI water mixed with tap, or adding driftwood and Indian almond leaves to naturally soften and acidify the water.

Symptoms to Watch For

• Loss of coloration (blue stripe fades or becomes patchy)
• White or grayish patches on the body
• Curved or lumpy spine
• Fish separating from the school
• Difficulty swimming, restlessness at night
• Cysts visible beneath the skin

Prevention

• Quarantine: Always quarantine new fish for 2-4 weeks
• Source: Buy from reputable stores with healthy-looking stock
• Water quality: Maintain pristine water conditions
• Stress reduction: Proper school size, hiding spots, stable parameters
• Remove dead fish: Immediately, since the parasite spreads when other fish eat infected tissue

If You Suspect NTD

Immediately isolate the affected fish. Unfortunately, euthanasia is often the most humane option as there is no cure and the fish will deteriorate. Monitor other fish closely. Note: "False Neon Tetra Disease" (bacterial) has similar symptoms but can be treated with antibiotics. A vet or experienced aquarist can help distinguish between them.