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Petrotilapia sp."nigra tanzania" is living in rocky habitats on an average depth of 8 to 15 metres. They can be found along the entire tanzanian coast northern from Mbamba Bay and also near Hai Reef and Undu Reef, southern from Mbamba Bay. These examples were caught in the neighbourhood of Undu Reef. In the lake the males of these species can grow to 17 cm, in the aquarium however they can grow a little taller because of a good feeding. The males can then grow to about 19 cm, females grow to about 14 cm. Petrotilapia sp."nigra tanzania" can 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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