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Petrotilapia xanthos can only be found near Gallireya Reef. They are living there in the intermediate zones from rocks to sand, however they are mainly holding up above flat stones which are lying spread over the sandbottom and which are covoured with sediment and sand. In the lake the males of these species can grow to 15 cm, in the aquarium however they can grow taller because of a good feeding. The males can then grow to about 17 cm, females grow to about 13 cm. Petrotilapia xanthos can behave intolerant against equal species, 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 everything they find on the rocks and plankton. 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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