Description
Meet Inpaichthys Luizae, the Black Arrow Tetra — a rare, high-impact freshwater fish that’s just entering the aquarium hobby. Formally described in January 2025, this striking species hails from the Rio Tapajós basin in Brazil, bringing a fresh wave of Amazonian intrigue to modern tanks.
What makes the Black Arrow Tetra stand out
Designed for aquarists who crave something truly distinctive, the Black Arrow Tetra features a sleek, dark silhouette and a bold, arrow-like cues in its body shape. Its dramatic coloration and poised, graceful swimming style create a visually compelling presence, whether you’re building a dedicated tetra school or a centerpiece display in a mixed community tank.
Ideal tank mates and behavior
This species thrives as a peaceful, schooling fish. In a suitably sized group (6–8 or more), it reveals natural social behavior, darting and gliding through mid to upper water levels. Pairing it with non-aggressive tankmates that share the same tropical tempo helps reduce stress and showcases its movement and color best. Plan open swimming space alongside planted areas or driftwood hides to create a balanced, visually dynamic aquarium.
Care essentials in plain terms
- Tank setup: a well-filtered, stable freshwater environment with moderate flow and ample swimming room.
- Diet: an adaptable omnivore that accepts high-quality flakes or pellets, plus occasional live or frozen foods to enrich feeding rituals.
- Maintenance: routine water quality, gradual parameter changes, and quarantine for new arrivals help keep the Black Arrow Tetra looking its best.
- Origin note: native to Brazil’s Rio Tapajós basin, which informs its preference for clean, well-oxygenated water and a stable tropical climate in captivity.
Why choose Inpaichthys Luizae over other tetras?
Beyond its rarity, the Black Arrow Tetra delivers a bold aesthetic that’s hard to match among common tetra varieties. Its unique dark, arrow-shaped profile provides a dramatic focal point in any aquarium, making it ideal for experienced hobbyists seeking a standout specimen or collectors building a purposefully curated plant-and-fish tableau.
Practical tips to get the most from your Black Arrow Tetras
- Introduce them in a calm, well-established tank to minimize stress during acclimation.
- Keep a consistent schedule for feeding and water changes to preserve their vivid coloration.
- Observe schooling behavior; a larger group will display more natural movement and reduce individually displayed stress.
- Source from reputable breeders or suppliers who prioritize health and ethical care to ensure robust, ready-to-thrive specimens.
With its rare lineage, formal description in 2025, and origin in Brazil’s Rio Tapajós basin, the Black Arrow Tetra is more than a fish—it’s a statement piece for serious hobbyists who value both beauty and a compelling story behind their aquarium residents. Add Inpaichthys Luizae to your tank and witness a living accent that elevates your setup from beautiful to unforgettable.
Shipping & delivery
LOCAL DELIVERY
1. Delivery within Singapore will be charged at a flat rate of SGD10 per order for standard delivery and SGD10 - 25 per order for express delivery, regardless of the number of items.
2. Local orders above SGD100 will be entitled to FREE standard delivery.
3. Your order will be delivered by courier for livestocks or by registered parcel for plants and accessories.
4. You will receive a notification via email or sms when the order has been dispatched.
5. We are unable to ship orders to restricted locations in Singapore including: Changi Air Freight Center, Changi Airport, Jurong Island, Jurong Port, PSA Terminal Wharves – Tanjong Pagar / Pasir Panjang / Sembawang and MINDEF COMCEN.
6. Your order will be ready for delivery within 3 to 7 working days (Wed or Saturday), orders for livestock will be packed on the same day for the dispatch.
7. In the event of Death on Arrival (DOA), please send clear photo or video of the unopened bag by email within 24 hours. Buyer can opt for a replacement of similar value and make payment for shipping again or request for a refund LESS the costs of delivery / shipping.
TRACKING YOUR ORDERS
- JANIO
- J&T EXPRESS
- LALAMOVE

- UPARCEL
International Shipment
(Shipment of wild bettas only )
Shipment Schedule
IMPORTER Contact Info
1. Orders from overseas will be dispatched directly from our holding facilities to the Exporter.
2. The shipping fee is calculated based on the number of fishes plus the cargo, quarantine costs from our holding facilities to the Exporter and all the way to the Transhipper (Importer).
3. The shipping fee DOES NOT cover the handling and postage fees from Transhipper to your address.
4. Buyers are required to PAY the transhipping fee directly to the Transhipper.
5. You will be notified of the shipment dates available via email.
6. It will take 2-3 days for the order to reach the Exporter, and another 1-2 days for it to arrive at your Transhipper.
7. The Transhipper will then ship the order to you upon receiving confirmation of your preferred shipping date and address.
8. In the event of Death on Arrival (DOA) with the exception of Betta Macrostomas, please send clear photo or video of the unopened bag by email within 24 hours. Buyer can opt for a replacement of similar value and make payment for shipping again or request for a refund LESS the costs of delivery / shipping.
Kindly email us at hello@ivenbetta.com.
Thank you for shopping with us.
Death on arrival (DOA)
In the event of death on arrival, please send a clear photo or video of the unopened bag by email to hello@ivenbetta.com within 24 hours. You can opt for a replacement of similar value (with shipping paid again) or a refund less the delivery / shipping costs.



