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Common name: Slender pike cichlid
Max. size: 4.0 cm SL
Gazetteer South America: Xingu River rapids in the vicinity of Altamira, Pará, Brazil.
Biology: A rheophilic species that dwells on rocky bottom rapids with water flow up to 1.7 m/sec. Perches solitary on top of boulders. Forages on rock surfaces and picks mostly on benthic preys; also feeds on micro-crustaceans (cladocerans, ostracods, copepods), immature aquatic insects (chironomids, ephemeropterans, trichopterans) and minute clams
So, this species would like some rocks in its environment as well as a good current.
Size gets much larger than 4 cm/2¼". Most males get to 12cm/4¾". Can be somewhat aggressive, & sensitive to polutants. Also don't ship well due to the need for lots of O2. The genus has been found in the Rio Tocantins, Xingu, Tapajós (south of the Amazon) & Rio Paru (on the north) I suggest that you read what Römer's Atlas has to say about this genus.