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Yes, they are a clearwater fish from the Rio Tapajós. Clearwater values typically range in the pH 5 - 6 range but can be higher or lower due to being almost pure H2O. It really depends on the location, water flow/rainfall, and time of day. Like any softwater environment (aquarium or Nature) pH can fluctuate wildly.
These fish were sent to me by a former Brazilian exporter and friend. At the time family and long work hours took precedence over hobbies, so sadly no I never even tried to breed them.