Type locality is ‘Rio das Mortes, some 100 km before its confluence with the Braço Maior of the Rio Araguaia (the western border of the Isla do Bananal). State of Mato Grosso.’
The das Mortes is a principal tributary of the Araguaia, itself the major affluent of the rio Tocantins within the lower Amazon basin in central and western Brazil, although the full range of H. amandae within the Araguaia system is unclear.
Little information appears to exist but presumably inhabits minor tributaries, backwaters and oxbow lakes rather than main river channels.
In the Araguaia drainage such habitats typically contain soft, weakly acidic water with the substrate covered by a layer of fallen leaves and branches.
Max Size: 15-20mm
Temperature: 20 – 28 °C
pH: 5.0 – 7.0
Hardness: 18 – 179 ppm
Source from: https://www.seriouslyfish.com/species/hyphessobrycon-amandae/