Santa Isabel “Altum” Angelfish

The Santa Isabel “Altum” Angelfish (Pterophyllum scalare) is one of the most impressive and sought-after wild angelfish varieties in the aquarium hobby. Originating from the Rio Negro region near Santa Isabel do Rio Negro, Brazil, this fish is famous for its extremely tall body, elongated fins, and striking vertical barring.

Although often referred to as an "Altum," the Santa Isabel is technically a naturally occurring form of Pterophyllum scalare. It displays many characteristics similar to true Altum Angelfish, including a taller profile, longer finnage, and a majestic appearance that makes it a centerpiece in any aquarium.

Mature specimens develop elegant trailing fins, subtle red and bronze highlights, and impressive height that can rival many true Altums. Their graceful swimming behavior and wild appearance make them highly desirable among angelfish enthusiasts.

Why Aquarists Love Santa Isabel Angelfish

• Stunning wild-type appearance
• Extremely tall body and elongated fins
• Beautiful vertical black barring
• Impressive centerpiece fish for display aquariums
• One of the most desirable wild angelfish varieties

Behavior & Compatibility

Santa Isabel Angelfish are peaceful but can become territorial during breeding.

Suitable tank mates include:

• Discus
• Larger Tetras
• Corydoras Catfish
• Peaceful Plecos
• Dwarf Cichlids

Avoid very small fish that may be viewed as food by adult specimens.

Ideal Aquarium Setup

These fish thrive in tall aquariums that replicate their natural blackwater habitat.

Recommended aquarium features include:

• Tall aquarium with open swimming space
• Driftwood and branches
• Dim lighting
• Live plants and leaf litter
• Gentle water flow

Stable water quality is essential for long-term success.

Diet and Feeding

Santa Isabel Angelfish are omnivores and readily accept a variety of foods.

Recommended foods include:

• Premium angelfish pellets
• Frozen bloodworms
• Brine shrimp
• Mysis shrimp
• High-quality flake foods

A varied diet helps promote healthy growth and finnage development.

Recommended Tank Parameters

Temperature: 78 – 84°F (26 – 29°C)
pH: 5.5 – 7.0
KH: 1 – 6 dKH
Minimum Tank Size: 55 gallons

Size Information

Average Adult Size:
6 – 7 inches (15 – 18 cm) body length

Adult Height:
Up to 10 – 12 inches (25 – 30 cm) including fins

Typical Sale Size:
2 – 4 inches (5 – 10 cm) including fins

Origin

Wild Origin:
Santa Isabel do Rio Negro, Amazonas, Brazil

River System:
Rio Negro Basin, Amazon River System

The Santa Isabel “Altum” Angelfish is a breathtaking wild angelfish prized for its towering profile, graceful finnage, and natural beauty. It is an exceptional choice for aquarists seeking a truly majestic centerpiece fish for a large planted or Amazon biotope aquarium. 🐟✨