What I wrote on Neocaridina parvidentata is partly based on my own experience. Mainly on that of Benjamin Wilden (Germany). This shrimp is definitely not the ideal solution of the problem but it has proved to come nearer to it than others more often used in the hobby. With a Microsiemens/cm of often 10 to 30 (which equals a hardness of below 0.5, with carbon hardness 0.0) all the normal aquarium shrimps cannot live.
Besides, the informations that are given by the shrimp-lovers are ambivalent and partly wrong. They concentrate fully on their shrimps (as we do on our Paros) and are not interested in their capacity to tolerate extreme water conditions but to describe the ideal conditions for them. So the conclusion is as I said before: We do not have the right shrimps up to now. If some tolerate our values it’s a matter of compromise.