Below is a snippet about the rive Atabapo,
just so you are not only atking my word for it.
Because this species is a fairly new addition to the aquarium hobby, expecting it to adapt to normal conditions of even pH 7 and moderate hardness, may lead to illness and loss.
The Rio Atabapo is a blackwater river with naturally
very low, acidic pH levels, typically ranging from 3.5 to 6.0, and very soft water with extremely low hardness, often described as having "hardly detectable" or 0-4 dH (GH) hardness.