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Petrotilapia sp."black flank" can mainly be found near Mphanga Rocks however they can also be found in less numbers near Katale Island and Luwino Reef. They are living there in rocky environments in the upper water levels to an average depth of about 10 metres. These examples were caught in the neighbourhood of Mphanga Rocks. In the lake the males of these species can grow to 14 cm, in the aquarium however they can grow a little taller because of a good feeding. The males can then grow to about 15 cm, females grow to about 11 cm. Petrotilapia sp."black flank" can sometimes be pretty intolerant towards male conspecifics, against other inhabitants they are in general tolerant. You can best keep this species together with multiple females and other mbunas in an aquarium with a lot of hiding places. In the lake they are mainly feeding themselves with algae which they find on 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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