Demasoni Cichlid

Also known as: Pseudotropheus demasoni

The Demasoni Cichlid (Pseudotropheus demasoni) is a strikingly colored dwarf mbuna from Lake Malawi, known for its intense blue and black vertical barring. The Demasoni Cichlid originates from Lake Malawi, Africa, specifically around Pombo Rocks in Tanzanian waters, reaches Adult size: 8-10 cm in captivity, typically lives 8-10 years, and is kept at 24-28°C (75-82°F). Individual fish vary, so treat this as a general guide rather than a guarantee.

Species at a glance

Origin: Lake Malawi, Africa, specifically around Pombo Rocks in Tanzanian waters
Adult size: Adult size: 8-10 cm (3.1-3.9 inches)
Life span: 8-10 years
Temperament: Highly aggressive and territorial, especially males; not suitable for community tanks
Tank size: Minimum 208 liters (55 gallons) for a single specimen; 303+ liters (80+ gallons) recommended for groups
Water temp: 24-28°C (75-82°F)
pH range: 7.8-8.6
Diet: Primarily herbivorous; requires high-spirulina flakes, blanched vegetables (spinach, zucchini), and occasional protein treats like brine shrimp; avoid fatty or mammal-based foods
Other names: Pseudotropheus demasoni

About the Demasoni Cichlid

The Demasoni Cichlid (Pseudotropheus demasoni) is a strikingly colored dwarf mbuna from Lake Malawi, known for its intense blue and black vertical barring. Males display more vibrant coloration than females, though both sexes are aggressive. This species is endemic to rocky shoreline habitats and exhibits strong territorial behavior, particularly during breeding. Due to its pugnacious nature, it requires careful tankmate selection and ample rockwork to establish territories.

Lifespan and health

With optimal care, Demasoni Cichlids typically live 8-10 years, though exceptional specimens may reach 12 years in pristine conditions. Longevity depends heavily on diet quality, water stability, and stress reduction; chronic aggression or poor nutrition can significantly shorten lifespan. Common health issues include Malawi bloat (often triggered by excessive protein or poor water quality), intestinal parasites, and stress-related infections from territorial conflicts. Signs of bloat include loss of appetite, swelling, and lethargy—treat with metronidazole-based medications and immediate dietary correction. Preventive measures include maintaining strict herbivorous diet, avoiding overcrowding, and ensuring excellent water quality through consistent maintenance.

Overview

Care and tank setup

Tank setup should include a sandy substrate with abundant rock formations creating caves and crevices for territory establishment; use limestone-based rocks to help buffer pH. Provide strong filtration to handle the bioload and maintain water clarity, with moderate water movement. A minimum tank length of 122 cm (48 inches) is advised to reduce aggression. Water parameters must be stable: perform 25-30% weekly water changes, maintain temperature between 24-28°C (75-82°F), and keep pH within 7.8-8.6 using crushed coral or buffering substrates if needed. Feed small amounts 2-3 times daily of high-quality spirulina-based flakes or pellets, supplemented with blanched greens; avoid overfeeding and protein-rich foods that can cause bloat. Tankmates should be other robust, similarly sized Lake Malawi mbuna with comparable aggression levels—such as certain Labidochromis or Melanochromis species—avoid peaceful fish, slow movers, or species with similar color patterns that may trigger aggression; never keep multiple males together unless in a very large tank (over 400 liters) with ample visual barriers.

Adding a Demasoni Cichlid? Research the species’ adult size and temperament carefully, quarantine new fish before introducing them to your tank, and buy from reputable aquarium stores or breeders.

Breed information on this page is based on the Wikipedia article on the Demasoni Cichlid, supplemented with additional research. Reviewed for accuracy.