A Fearless Beauty
Pseudotropheus demasoni is one of the most breathtaking cichlids from Lake Malawi, but do not let its modest size fool you. As an aquarist, one quickly learns that this species is among the most aggressive dwarf mbunas. Many hesitate to keep them due to their reputation for territorial aggression, especially toward their own kind.
Behavior and Tank Mates
The Demasoni is known to be extremely aggressive depending on the conditions and company it is kept in. It is particularly hostile toward other fish with similar stripe patterns. To disperse aggression, it is often recommended to keep them in larger groups (preferably 12+ individuals), as smaller groups often suffer fatalities where the strongest individuals eliminate the weakest.
Breeding Experiences
As a mouthbrooder, it is fascinating to observe. While they are often quick to spawn, it frequently takes several attempts before the female completes a full brooding cycle without swallowing the eggs. My personal experience began with small broods of just 3 fry, but once the colony is established, you can quickly have a healthy group of young fish growing up. However, it requires patience and proper hiding spots provided by extensive rock formations.
Tank Setup and Care
Due to their behavior, the aquarium should not be too small (minimum 128 liters for a small group), and the decor must consist of many caves. Water parameters should reflect the natural conditions of Lake Malawi with high pH and hardness.
