Green Terror Cichlid (Andinoacara rivulatus)

The Green Terror Cichlid (Andinoacara rivulatus) is a large, highly aggressive freshwater fish native to the calm river basins of Ecuador and Peru. Renowned for its stunning metallic green-blue scales and fiery orange fin borders, this species earns its "terror" moniker from its intensely territorial behavior. It is a powerful centerpiece fish best suited for experienced aquarists who can manage its large size and bold personality.

Quick Species Overview

Adult Size: Males reach 8 to 12 inches (20–30 cm); females are smaller at 6 to 8 inches.

Lifespan: 10 to 15 years with proper care.

Temperament: Semi-aggressive to highly aggressive; very territorial.

Diet: Omnivorous with a preference for high-protein foods.

Tank Setup & Water Parameters

Green Terrors need plenty of space and highly efficient filtration to handle their waste and accommodate their large size.

Minimum Tank Size: 55 gallons for a single fish; 75 to 125 gallons for a pair or a community setup.

Water Temperature: 72°F to 80°F (22°C to 27°C).

pH Range: 6.5 to 7.5 (can tolerate up to 8.0, but prefers slightly acidic to neutral).

Water Hardness: Soft to medium water.

Substrate & Decor: Use sandy substrate because they love to dig. Provide sturdy rockwork and driftwood for hiding spaces.

Aquascaping Note: They will uproot loose live plants. If you want live greenery, secure hardy plants like Anubias or Java Fern into heavy ceramic pots.

Diet and Feeding

These fish are hardy eaters and thrive on a diverse, high-protein diet.

Base Diet: High-quality cichlid pellets or flakes.

Live or Frozen Foods: Supplement with bloodworms, brine shrimp, krill, and earthworms.

Vegetables: Occasional spirulina flakes or blanched peas help maintain digestive health.

Tank Mates Compatibility

Do not house Green Terrors with small, peaceful community fish like neon tetras or guppies, as they will be eaten. If you want to keep them with companions, choose large, robust species that can hold their own:

Good Tank Mates: Oscar fish, Jack Dempsey, Firemouth cichlids, Silver Dollars, large plecostomus, and Geophagus.

Safety Tip: Always monitor aggression levels. If a Green Terror claims the entire tank, you may need to move it to a larger setup or separate it using a tank divider.