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Pseudotropheus johannii (formerly known as Melanochromis johannii) is found along the rocky coasts between Makanjila Point and Chuanga. This variant is from Gome Rock. In the lake the males of these species can grow to 8 cm, in the aquarium however they can grow taller because of a good feeding. The males can then grow to about 10 cm, females grow to about 8 cm. Pseudotropheus johannii can behave intolerant against equal male species, against other inhabitants they are in general tolerant. You can best keep this species with multiple females and other mbuna in an aquarium with a lot of hiding places. In the lake they are mainly feeding themselves with everything they can find on the rocks which are covered with algae, also they eat the algae from the rocks. In the aquarium they are comfortable with any food. They take everything they get offered, like spirulina pellets, mysis, artemia, cyclops and shrimp-peas mix. Food rich of algae like spirulina pellets or flakes is very important to them so this should not be missing on their menu. 
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