6-Pack Longfin Black Skirt Tetra Live Freshwater Tropical Aquarium Fish School

The Longfin Black Tetra (Gymnocorymbus ternetzi), also known as the Longfin Black Skirt Tetra, is a beautiful and popular freshwater aquarium fish, admired for its elegant flowing fins, distinctive dark coloration, and active schooling behavior. This attractive longfin variety adds graceful movement and striking contrast to planted aquariums and peaceful tropical community setups.

This listing includes 6 healthy Longfin Black Tetras.

Longfin Black Tetras feature a beautiful combination of silver-gray and charcoal-black coloration, complemented by distinctive vertical dark markings and elongated, flowing fins. Their extended dorsal, anal, and tail fins create an elegant appearance as they swim together. Juveniles often display stronger dark coloration, while adults may gradually develop softer silver and gray tones.

These beautiful tetras typically reach approximately 2–2.5 inches as adults, making them an excellent choice for appropriately sized community aquariums. Their attractive appearance and lively swimming behavior make them especially impressive when maintained in groups.

Longfin Black Tetras thrive in well-maintained freshwater aquariums with clean water, stable parameters, gentle to moderate water circulation, and plenty of swimming space. A planted aquarium with driftwood, natural decorations, and open swimming areas provides an excellent environment for their natural behavior.

These fish are social and should be maintained in groups of at least six individuals. Keeping them in a proper school helps promote natural behavior and may reduce occasional fin-nipping tendencies. Although generally peaceful, Black Skirt Tetras can sometimes nip the fins of slow-moving or delicate long-finned tankmates, so companions should be selected carefully.

As omnivores, Longfin Black Tetras readily accept high-quality tropical flakes, small pellets, frozen brine shrimp, bloodworms, daphnia, and other appropriately sized aquarium foods. A balanced and varied diet helps maintain healthy growth, attractive coloration, and overall well-being.

Their graceful flowing fins, beautiful dark coloration, and active schooling behavior make Longfin Black Tetras an excellent addition to freshwater community aquariums.

Each fish is carefully selected and professionally packed with oxygen and insulation for transportation. Photos are representative; natural variations in coloration, markings, fin length, and overall appearance may occur. Fish are sold unsexed, and specific male-to-female ratios cannot be guaranteed.

You will receive 6 healthy Longfin Black Tetras (Gymnocorymbus ternetzi).

🚚 Shipping Policy – Lightning Aquatics World

1. 📦 Preparation & Packaging

• Each fish is carefully hand-selected and packed in oxygenated, treated water.
• Securely sealed bags are placed inside insulated thermal boxes to maintain stable conditions during transit.

2. 🚛 Shipping Options

• Standard Shipping (2-Day): Available Monday–Wednesday.
• Express Shipping (Next Day): Available Monday–Thursday for an extra fee.
  We recommend Express for extreme weather or sensitive species.

3. 🗓️ Shipping Schedule

• Orders placed Monday to Wednesday: Ship same week.
• Orders placed after Thursday: Ship the following Monday, to avoid weekend delays.

4. 📬 Customer Availability

Please ensure someone is available to receive the package at the time of delivery. Prompt reception is essential to maintain a healthy environment inside the box.

✅ Live Arrival Guarantee

We guarantee all fish will arrive alive and healthy. If you receive a DOA (Dead on Arrival):

• Contact us within 2 hours of delivery.
• Provide clear photos of the fish inside the sealed bag.
• We’ll evaluate the case and may offer a replacement or partial refund, depending on the situation.
  Note: Guarantee void if no one is present at first delivery attempt.

🌡️ Weather & Shipping Restrictions

Shipments may be postponed during extreme temperatures (heatwaves, freezing).
We only ship to areas where delivery can be guaranteed within 48 hours.

🐟 Buyer Responsibility

• Ensure the species is compatible with your aquarium setup and local regulations.
• We do not accept returns for compatibility issues, mistaken selection, or inadequate tank conditions.
• Fish are kept in clean, oxygenated water and monitored daily for health.

📸 Photo Disclaimer
Photos are for reference only. You will receive fish similar in size, color, and quality. If you wish to choose specific individuals, a selection fee may apply. Please contact us before purchase.

🧠 Helpful Tips

• Acclimate your fish slowly using a drip method.
• Avoid sudden changes in water temperature or pH.
• Test water parameters before adding new fish.

🌊 Why Buy from Lightning Aquatics World?

• Professional live fish supplier based in Texas
• Expert care, top-quality livestock, fast response time
• We love what we do — and it shows in every shipment

Questions? Message us anytime. We're here to help before and after your purchase!