Description
Costae Tetra (Moenkhausia costae)
📌 Basic Info
Scientific Name: Moenkhausia costae
Common Name: Costae Tetra / Black-Line Tail Tetra
Size: ~2.4 inches (6 cm)
Lifespan: 3 – 5 years
Tank Zone: Middle to upper swimmers
🌊 Water Parameters
TDS (Total Dissolved Solids): 80 – 200 ppm
pH: 6.0 – 7.5
Temperature: 22°C – 28°C (72°F – 82°F)
Water Type: Soft to moderately hard, well-filtered water
🐟 Characteristics
Peaceful, active schooling tetra; thrives in groups
Shiny silver body with a black stripe through tail and anal fin
Energetic swimmers, especially in planted tanks with open space
Hardy, adaptable, beginner-friendly
🍽️ Food
Type: Omnivorous
Diet: Flakes, micro-pellets, frozen/live foods (brine shrimp, daphnia, bloodworms)
Feeding Frequency: 1–2 times daily, in small portions
🛠️ Maintenance
Weekly water change: 20–30%
Needs both plants and free swimming space
Use gentle to moderate filtration, avoid strong currents
Keep a tight lid—Costae Tetras are jumpers
👥 Social Behavior
Minimum Group Size: 6 (better in 8–10+)
Tank Mates: Peaceful species – small tetras, rasboras, guppies, mollies, corydoras, shrimps, snails
Avoid: Aggressive or fin-nipping fish, and very large species
✅ Do’s
Keep in schools for best color and confidence
Provide plants, driftwood, and hiding spots
Maintain stable water conditions with regular cleaning
❌ Don’ts
Don’t keep them alone or in pairs → causes stress
Don’t mix with aggressive or big fish
Don’t neglect tank lid → they can jump
⭐ Quick Tips
Peaceful, colorful schooling fish—great for community tanks
Look most vibrant in planted aquariums with darker substrates
A hardy and attractive choice for both beginners and experienced aquarists
