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Blackline Rasbora

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fisheasy Care

Blackline Rasbora

Rasbora borapetensis

Overview

The Blackline Rasbora, known scientifically as Rasbora boraras, is a small, attractive freshwater fish popular among aquarists. This species is favored for its striking appearance and peaceful nature, making it a suitable addition to community aquariums.

Natural Habitat

Blackline Rasboras are native to the shallow waters of Southeast Asia, particularly in the forested regions of Malaysia and Indonesia. They thrive in slow-moving streams and rice paddies, where plants and submerged structures provide plenty of shelter.

Care Requirements

Caring for Blackline Rasboras is relatively simple, making them an excellent choice for both novice and experienced aquarists. They appreciate a well-planted tank with ample hiding spots. A minimum tank size of 60 liters is recommended if kept in groups. These fish are best kept in schools of at least six individuals to promote natural behavior and reduce stress.

Tank Setup

When setting up a tank for Blackline Rasboras, consider the following:

  • Substrate: A soft, fine substrate is ideal to mimic their natural environment.
  • Plants: Dense planting, including floating plants, will provide cover and create a tranquil environment.
  • Decor: Include driftwood and rocks for additional hiding places.

Water Parameters

Blackline Rasboras prefer stable water conditions:

  • Temperature: 24-28°C (75-82°F)
  • pH: 6.0-7.5
  • Hardness: Soft to moderately hard water.

Compatibility

These fish are known for their peaceful temperament and can coexist with a variety of tank mates. Suitable companions include:

  • Other small tetras and rasboras
  • Cherry shrimp
  • Small catfish

Avoid aggressive or large fish, as they can intimidate the Blackline Rasbora.

Feeding

In nature, the Blackline Rasbora feeds on small insects and crustaceans. In captivity, they adapt well to high-quality flake food, micro-pellets, and live or frozen foods such as brine shrimp and daphnia. Ensuring a varied diet will promote brighter colors and healthy growth.

Lifespan

With proper care, Blackline Rasboras can live for 3-5 years in the aquarium setting. Maintaining stable water parameters and a balanced diet is crucial for their longevity.

How to care for Blackline Rasbora

  1. 1

    Set up the tank

    Choose a tank with ample horizontal space, as Blackline Rasboras are active swimmers. A 10-gallon tank is suitable for a small school, but larger schools require bigger tanks.

  2. 2

    Acclimate slowly

    When introducing Blackline Rasboras to your tank, acclimate them slowly to prevent stress. Gradually mix tank water with the water they arrived in over a period of 30 minutes.

  3. 3

    Maintain water parameters

    Keep the water temperature between 72°F and 79°F (22°C - 26°C) and the pH between 6.5 and 7.0. Regularly test water parameters to ensure stability.

  4. 4

    Provide a balanced diet

    Feed Blackline Rasboras a variety of foods, including high-quality flake or pellet food, supplemented with live or frozen foods like brine shrimp and daphnia to enhance their coloration.

  5. 5

    Monitor tank mates

    Blackline Rasboras are peaceful and do well with other non-aggressive species. Avoid keeping them with larger or more aggressive fish that might pose a threat.

Frequently asked questions

What is the ideal tank size for Blackline Rasboras?▾

A school of six Blackline Rasboras can live in a 10-gallon aquarium. For larger schools, a larger tank is recommended. They need lots of horizontal space as they are very active swimmers. Short and wide tanks are better than tall and narrow.

What water temperature do Blackline Rasboras prefer?▾

Blackline Rasboras prefer temperatures between 72°F and 79°F (22°C - 26°C). Higher temperatures within this range can increase their activity.

What is the maximum size of Blackline Rasboras?▾

Blackline Rasboras can reach a maximum size of around 2.4 inches (6 cm).

What is the lifespan of Blackline Rasboras?▾

With proper care, Blackline Rasboras can live between 5 to 7 years.

What is the ideal pH level for Blackline Rasboras?▾

Blackline Rasboras thrive in water with a pH between 6.5 and 7.0, which is slightly acidic to neutral.