“Neocaridina parvidentata” are listed here in the states as “caridina parvidentata” not sure if the same but they are called “Malawa” shrimp, which they say prefer hard water and are considered one of the Suluwasi species which do require very hard water high pH.
BUT:
I know of breeders that keep them in normal soft water situations, and they are VERY productive. I will contact the people and see if they know the actual parameters where these are found… it is possible that they are NOT Suluwasi Lakes type shrimp, and even tolerate low pH. If necessary I will get a few and see what happens.
Nearly everone (shrimpers) keep their water in a pH area of 6.6 – 7.4
That does not mean they are not low pH tolerant at all… those are the parameters the industry goes for as a generic for nearly all of the ornamental types… Malawa are a clean species not bred for any special traits yet.
Malawa is close to the same word as Malawi which would be an African species but I suspect not so.
I can easily get some and try although I only know of 2 folks that keep them.. ha another project !!!
And there is also a Malaya species I. looking into… it is a caridina type shrimp.