Pterophyllum altum, commonly known as the Altum Angelfish or Orinoco Angel, is a majestic and highly prized species of angelfish that adds a touch of grace and splendor to any aquarium. With its graceful appearance and tall, triangular body shape, the Altum Angelfish is a popular choice among experienced aquarists who seek a stunning centerpiece fish for their tanks. Originating from the upper Orinoco River basin in South America, these angelfish are known for their regal demeanor, unique behavior, and their preference for larger and well-maintained aquariums. Let's explore a detailed description of these remarkable angelfish, including essential information on their appearance, water conditions, tank setup, feeding habits, and care.

Appearance:

• Graceful Body Shape: Pterophyllum altum features a tall, triangular body shape with long and flowing fins, giving them a majestic and elegant appearance in the aquarium.
• Size: They are larger than the more common Pterophyllum scalare, with adult Altum Angelfish reaching lengths of up to 10 inches (25 centimeters) or more.

Water Conditions:

• Temperature: Maintain a tropical water temperature range of 76°F to 84°F (24°C to 29°C) to ensure the well-being of Altum Angelfish.
• pH Level: Aim for a slightly acidic to neutral pH level between 6.0 and 7.5 to replicate their natural habitat.
• Water Hardness: Provide a moderately soft to moderately hard water with a hardness level between 4 and 12 dGH.

Tank Setup:

• Tank Size: Pterophyllum altum requires a spacious tank of at least 75 gallons (284 liters) due to their size and active swimming behavior.
• Vertical Space: Provide ample vertical swimming space to accommodate their tall body shape and graceful movements.
• Aquascape: Create a well-decorated environment with driftwood, tall plants, and open swimming areas to mimic their natural habitat and offer hiding spots.

Feeding Habit:

• Omnivorous Diet: Altum Angelfish are omnivores and accept a varied diet.
• High-Quality Flakes and Pellets: Offer high-quality angelfish pellets or flakes as their primary diet.
• Live and Frozen Foods: Provide occasional treats of live or frozen foods such as brine shrimp, bloodworms, or small insects to supplement their diet.

Care:

• Peaceful Nature: Pterophyllum altum is generally peaceful but can be territorial during breeding.
• Observation: Monitor their behavior and appearance to ensure they are healthy and showing no signs of stress or illness.