Blackline Tail Tetra (Moenkhausia costae) – 3–4 cm

🐠 Species Overview

The Blackline Tail Tetra (Moenkhausia costae) is a small, active schooling fish native to the São Francisco and Itapicuru rivers in Brazil. This species is characterized by its slender, translucent body adorned with a distinctive black stripe running from mid-body through the tail, giving it a sleek and striking appearance. Their peaceful nature and vibrant coloration make them a popular choice among aquarists.

🏡 Aquarium Setup & Care Instructions

Tank Size & Environment

• Minimum Tank Size: A 20-gallon (76 liters) aquarium is recommended for a small group.

• Substrate: Fine gravel or sandy substrate to mimic their natural environment.

• Decor: Incorporate driftwood, rocks, and dense plantings to provide hiding spots and simulate their natural habitat.

• Water Parameters:

  • Temperature: 24–28°C (75–82°F)

  • pH: 6.0–7.5

  • Hardness: Soft to moderately hard water

  • Filtration: Well-filtered water with gentle circulation.

Behavior & Tankmates

• Temperament: Peaceful and non-aggressive.

• Social Structure: Best kept in groups of 6 or more to encourage natural schooling behavior.

• Compatibility: Compatible with other small, non-aggressive species. Avoid keeping with slow-moving or long-finned fish.

Diet

• Feeding Habits: Omnivorous.

• Dietary Needs: Offer a varied diet including high-quality flakes, micro pellets, and occasional frozen foods like brine shrimp and daphnia.