Monoculus Peacock Bass (6–8 cm) – a powerful Amazon predator with bold vertical bars and a classic ocellus spot. Perfect for large, aggressive fish tanks.

The Monoculus Peacock Bass (Cichla monoculus) is a classic and highly popular species of peacock bass, native to the Amazon River Basin. Known for its torpedo-shaped body, striking vertical bars, and distinctive tail ocellus, this species is a top choice for monster fish enthusiasts.

At 6–8 cm, these juveniles are perfect for grow-out tanks before moving to a larger setup. In captivity, Monoculus Peacock Bass can reach 50–60 cm (20–24 inches), making them suitable only for experienced aquarists with large aquariums or ponds.

Unlike some rarer species, Monoculus is hardy and adaptable, making it a great entry into the world of peacock bass while still offering the stunning beauty and power of these predatory fish.

✅ Key Features

• Size: 6–8 cm juvenile; adults grow 50–60 cm

• Temperament: Aggressive, highly predatory

• Care Level: Advanced

• Lifespan: 10–15 years with proper care

• Special Trait: Classic tail ocellus and three bold vertical bars

Care Guide for Monoculus Peacock Bass

✅ Tank Requirements

• Minimum Tank Size: 500 liters (130 gallons) for juveniles; 1,000+ liters for adults

• Aquascape: Large open spaces for free swimming

• Filtration: Heavy-duty filtration for clean, oxygen-rich water

• Lighting: Moderate to highlight their colors

• Cover: Secure lid, as they can jump when startled

✅ Water Parameters

• Temperature: 25°C – 30°C (77°F – 86°F)

• pH Level: 6.0 – 7.5

• Water Hardness: Soft to moderately hard

• Maintenance: Weekly water changes of 30–40% for pristine water quality

✅ Feeding Habits

Monoculus Peacock Bass are strict carnivores with a strong preference for live prey when young.

• Recommended Diet:

  • Live feeder fish (for early stages)

  • Fresh or frozen fish fillets

  • Prawns and shrimp

  • Large carnivore pellets (with acclimation)

Feed once daily or every other day, offering portions it can consume quickly to maintain water quality.

✅ Tank Mates

Due to their aggressive nature, tank mates should be large and robust.

Suitable Companions:

• Other Peacock Bass species

• Arowanas

• Gars

• Large Catfish (Pimelodids, Doradids)

Avoid small or slow fish—they will be eaten.

✅ Behavior & Personality

• Behavior: Active mid-water predator, highly aggressive during feeding

• Activity: Requires open swimming space and strong filtration

• Special Note: Responds well to keepers and can be trained to accept prepared foods

Why Choose Monoculus Peacock Bass?

• The classic Peacock Bass for monster fish setups

• Hardy, adaptable, and visually striking

• Perfect choice for predator aquariums or custom-built tanks

✅ Ideal for Amazon-themed predator aquariums
✅ A must-have for advanced aquarists and serious collectors