Demasoni Cichlid
Pseudotropheus demasoni
A small but feisty electric blue-and-black striped Mbuna best kept in large groups.
| Difficulty | Intermediate |
| Min. Tank Size | 200 L |
| Temperature | 24.0–28.0 °C |
| pH Range | 7.5–8.6 |
| Max Size | 8.0 cm |
| Lifespan | 6-10 years |
| Diet | Omnivore |
| Temperament | Aggressive |
Overview
The Demasoni Cichlid (Pseudotropheus demasoni) is a small but feisty electric blue-and-black striped Mbuna best kept in large groups. It is a popular choice among Australian aquarists, reaching around 8 cm and living roughly 6-10 years when properly cared for.
This complete guide covers how to keep the Demasoni Cichlid successfully - tank size and setup, water parameters, the best foods (including recommended brands), suitable tank mates, breeding, sexing and the health issues to watch for. It is rated Intermediate to care for.
Natural Habitat & Origin
This cichlid comes from the warm rivers, lakes and floodplains of the Americas or Africa, where it forms territories and shows complex, intelligent behaviour. A stable, well-aquascaped tank with the right hardscape brings out its best.
Matching the temperature, water chemistry and cover a species evolved with is the simplest route to keeping it healthy and seeing its natural behaviour and colour.
Tank Size & Aquarium Setup
Provide a minimum of 200 litres for the Demasoni Cichlid. As a group-living species, swimming length and floor space matter more than height.
Use sand or fine gravel with rocks, caves or driftwood to create territories and sight-breaks, which dramatically reduces aggression.
Always add fish only to a fully cycled, mature tank with stable biological filtration. Match filtration generously to the fish's size and waste output.
Water Parameters
Keep the Demasoni Cichlid in stable water at 24-28 °C with a pH of 7.5-8.6. It prefers harder, alkaline water, which matches much of Australia's tap supply.
Test regularly: ammonia and nitrite must read zero, and nitrate should be kept low with routine partial water changes. Always dechlorinate and temperature-match new water, because sudden swings cause far more illness than water that is stable but slightly imperfect.
Diet & Feeding
The Demasoni Cichlid is an easy-going omnivore that accepts a wide range of foods.
In Australia, good options include Hikari Cichlid Gold, API Cichlid Pellets and Dymax frozen bloodworm and brine shrimp. Feed small amounts once or twice a day (only what is cleared in a minute or two), vary the diet for the best colour and health, and avoid overfeeding, which is the leading cause of poor water quality.
Temperament & Tank Mates
The Demasoni Cichlid is aggressive and is best kept alone or only with very carefully chosen, equally robust tank mates in a large tank. Avoid keeping it with small or timid species it will bully or eat.
It is happiest in a group of its own kind and is shyer and less settled when kept alone.
Breeding
The Demasoni Cichlid is a mouthbrooder - the parent holds the fertilised eggs and fry safely in its mouth until they can swim and feed on their own.
Even if you are not planning to breed it, recognising this behaviour helps you understand what you are seeing and respond well - for example by adding cover for fry or giving a guarding pair extra space.
How to Tell Males from Females
Males are often larger with longer, more pointed fins and brighter colour; females are smaller and rounder, and many show clear breeding colours when paired.
Common Health Problems
Like most aquarium species it can suffer from white spot (ich), fin rot and fungal or bacterial infections, almost always triggered by stress or poor water quality. Quarantine new arrivals for 2-4 weeks and watch daily for early signs such as loss of appetite, unusual hiding, clamped fins or laboured breathing - caught early, most issues are very treatable.
Prevention beats cure: keep water pristine, avoid overstocking and overfeeding, quarantine new arrivals, and act at the first sign of trouble.
Is the Demasoni Cichlid Right for You?
The Demasoni Cichlid suits keepers with some experience and a stable, mature, appropriately sized tank, as long as you can provide at least 200 litres, water at 24-28 °C and pH 7.5-8.6, the right diet and a proper group of its own kind.
Meet those needs and the Demasoni Cichlid will reward you for around 6-10 years. Use our free aquarium calculators to plan your setup, and explore our other fish, plant and disease guides to build a thriving aquarium.
