Green terror cichlid - Aequidens rivulatus

Scientific name: Aequidens rivulatus

Common name: Green terror cichlid

Family: Cichlidae

Usual size in fish tanks: 15 - 20 cm (5.91 - 7.87 inch)

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Recommended pH range for the species: 6.5 - 7.5

Recommended water hardness (dGH): 4 - 15°N (71.43 - 267.86ppm)

0°C 32°F30°C 86°F

Recommended temperature: 20 - 24 °C (68 - 75.2°F)

The way how these fish reproduce: Spawning

Where the species comes from: South America

Temperament to its own species: aggressive/territorial

Temperament toward other fish species: aggressive/territorial

Usual place in the tank: Middle levels

Green Terror Cichlid Overview

The Green Terror Cichlid (Aequidens rivulatus) is a striking and robust cichlid species native to the rivers and streams of South America. They are often mistaken for the Blue Acara, particularly when they are juveniles due to their similar coloration. However, the Green Terror Cichlid grows larger and has a much higher level of aggression. Adult Green Terror Cichlids reach sizes of 15 to 20 cm (5.91 to 7.87 inches), making them a substantial presence in any aquarium. Due to their active nature and large size, a minimum tank size of 208 liters (55 gallons) is required, with even larger tanks being preferable to accommodate their territorial behavior.

Tank Setup and Filtration

Green Terror Cichlids are high-waste producers, so an efficient filtration system is essential. Choose a filter rated for a larger tank than the one you have to ensure that waste is effectively managed. These fish are avid diggers; therefore, if you plan to have a planted aquarium, opt for hardy plants such as Anubias or Java Fern, which can be potted or securely anchored to withstand their digging behavior.

Water Parameters

Green Terror Cichlids thrive in stable water conditions with temperatures between 20-24°C (68-75.2°F). The pH should be maintained between 6.5 and 7.5, and water hardness should be between 4 to 15°N (71.43 - 267.86 ppm). Regular water changes are important to maintain quality, especially considering their high-waste output.

Feeding

Green Terror Cichlids are omnivores and benefit from a varied diet. A mix of high-quality cichlid pellets or flakes, live or frozen foods like brine shrimp, bloodworms, and small feeder fish can be provided. Additionally, offering some plant-based foods, such as spirulina-based flakes or blanched vegetables, will help ensure balanced nutrition. Adults should be fed once or twice a day, while fry require more frequent feedings (4-5 times a day). Green Terrors forage throughout all levels of the tank, so they do not have a specific feeding area.

Sexing

Males are typically larger and more vibrantly colored than females, with a noticeable nuchal hump on their foreheads. Females generally have a smaller, more rounded body shape. Juveniles often display a bluer hue, which may cause confusion with the Blue Acara. As they mature, their colors shift to the distinctive green shades that give them their name.

Breeding

Green Terror Cichlids are egg-layers and can be bred in captivity. The female will clean a flat surface, such as a rock or piece of driftwood, to prepare for spawning. Once the eggs are laid, both parents protect the eggs and fry. The eggs hatch within 48-72 hours, and the fry become free-swimming a few days later. It's important to monitor water parameters and ensure a calm environment during breeding, as males can be aggressive towards females before spawning but will typically become devoted parents afterward.

Frequently Asked Questions

What do fertilized Green Terror Cichlid eggs look like?

Fertilized eggs are transparent, while unfertilized or fungus-affected eggs turn white. Parent fish may remove white eggs from the batch to protect the developing fry.

Do Green Terror Cichlids fight during breeding?

Yes, males may become aggressive towards females during the breeding process. However, once spawning is complete, both parents typically exhibit protective and caring behavior towards the fry.

Lifespan

Green Terror Cichlids have a lifespan of 10 years or more when provided with proper care. Stable water conditions, a nutritious diet, and a well-maintained tank are crucial factors for their longevity.

Short Description

The Green Terror Cichlid (Aequidens rivulatus) is a vibrant, large cichlid species native to South America. They are known for their territorial and aggressive nature, requiring a spacious tank and careful selection of tank mates. While their care needs are moderate, they make fascinating additions to an aquarium for experienced hobbyists. Proper feeding, tank maintenance, and stable water conditions are key to keeping these cichlids healthy and thriving.

Pictures

Thanks to Corey Bower for pictures of Green terror cichlid! Some pictures were bought by aqua-fish.net from jjphoto.dk. Also thanks to Heather.