Blueline Angelfish

Blueline Angelfish
Latin name:
(Chaetodontoplus septentrionalis)

Care Level





Black, Blue, Yellow



Preferred Conditions

With Caution

Avg. Max Size

sg 1.020-1.025, 72-78° F, dKH 8-12, pH 8.1-8.4

Minimum Tank Size



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Are you captivated by the stunning beauty and graceful movements of angelfish? Among the many captivating species, the Blueline Angelfish stands out with its striking blue stripes and peaceful demeanor. In this comprehensive guide, we’ll delve into the fascinating world of Blueline Angelfish, providing insights into their care, breeding, and compatibility, so you can create a thriving and harmonious aquarium.

Blueline Angelfish: An Overview

The Blueline Angelfish, scientifically known as Pterophyllum leopoldi, is a freshwater fish native to the Amazon River basin in South America. Renowned for its elongated body, pointed fins, and vibrant blue stripes, this angelfish species exudes elegance and charm. Blueline Angelfish typically reach a size of 6-8 inches, making them a captivating centerpiece for medium to large aquariums.

Characteristics and Behavior

Blueline Angelfish possess a captivating appearance, featuring a silvery-white body adorned with four to five vertical blue stripes. These stripes, which extend from the head to the tail, create a striking visual contrast against the fish’s body. Blueline Angelfish are generally peaceful and docile, making them suitable for community tanks. However, they can display territorial behavior during breeding or when protecting their young.

Care and Maintenance

Providing a suitable environment for Blueline Angelfish is essential for their well-being and longevity. Let’s explore the key aspects of their care and maintenance:

Tank Size and Setup

Blueline Angelfish require a spacious tank to thrive. A minimum tank size of 20 gallons is recommended for a single fish, with an additional 10 gallons for each additional fish. The tank should be equipped with a reliable filter to maintain water quality and a heater to keep the temperature within the ideal range of 78-86°F. Live plants, such as Amazon sword or water sprite, can be added to provide hiding places and enhance the natural beauty of the aquarium.

Water Parameters

Blueline Angelfish prefer slightly acidic water conditions with a pH range of 6.0 to 7.5. The water hardness should be maintained between 5 and 15 dGH, and the temperature should be kept stable within the recommended range. Regular water changes of approximately 20-30% every week are essential to maintain water quality and prevent the buildup of harmful toxins.

Diet and Nutrition

Blueline Angelfish are omnivorous and have a varied diet. They readily accept a variety of live, frozen, and flake foods. Live foods, such as brine shrimp and bloodworms, are a great source of protein and can be offered as occasional treats. Frozen foods, such as mysis shrimp and daphnia, are also a good option. Flake foods should be of high quality and specifically formulated for angelfish or tropical fish.

Breeding Blueline Angelfish

Breeding Blueline Angelfish can be a rewarding experience for aquarists. Here are some key considerations for successful breeding:

Selecting a Breeding Pair

Choosing a compatible breeding pair is crucial for successful breeding. Look for healthy and mature fish that display breeding coloration. Males typically develop a more pronounced hump on their forehead, while females have a rounder belly. Introduce the pair to a separate breeding tank to minimize distractions and provide a controlled environment.

Preparing the Breeding Tank

The breeding tank should be at least 20 gallons in size and equipped with a sponge filter to prevent fry from being sucked in. Add plenty of live plants, such as Java moss or Amazon sword, to provide hiding places for the fry. The water parameters should be maintained within the ideal range for Blueline Angelfish, and the temperature should be slightly elevated to around 82-84°F to stimulate breeding.

Spawning and Egg Care

Blueline Angelfish typically spawn on flat surfaces, such as leaves or rocks. Once the female lays her eggs, the male will fertilize them. The eggs hatch within 2-3 days, and the fry become free-swimming after about a week. Feed the fry with infusoria or newly hatched brine shrimp until they are large enough to accept larger foods.

Compatible Tank Mates

Blueline Angelfish can coexist peacefully with other non-aggressive species in a community tank. Some suitable tank mates include:

  • Tetras
  • Corydoras catfish
  • Platies
  • Swordtails
  • Rummy nose tetras

Avoid keeping Blueline Angelfish with aggressive or fin-nipping species, as they may harass or injure them.

FAQs About Blueline Angelfish

  1. What is the lifespan of a Blueline Angelfish?
  2. With proper care and maintenance, Blueline Angelfish can live for up to 10 years in captivity.

  3. How can I prevent aggression in my Blueline Angelfish?
  4. Provide a spacious tank with plenty of hiding places and avoid overcrowding. Introduce tank mates carefully and monitor their interactions closely.

  5. What are some common diseases that affect Blueline Angelfish?
  6. Blueline Angelfish are susceptible to common fish diseases such as ich, fin rot, and bacterial infections. Maintain good water quality and provide a healthy diet to help prevent diseases.


The Blueline Angelfish is a captivating and elegant addition to any aquarium. With their striking blue stripes, peaceful demeanor, and relatively easy care requirements, they are a popular choice among aquarists of all levels. By providing a suitable environment, maintaining good water quality, and offering a varied diet, you can ensure the health and well-being of your Blueline Angelfish, allowing them to thrive and showcase their natural beauty in your aquarium.