Recommendations would be to try and find a local keeper in the same area which raise them in standard water local to you, not RO/DI or extra stuff other than the basics of water treatment. Which says they breed like crazy , meaning they are adapted to the water like you have.
Otherwise some form of Cherry/ Neocaridina shrimp like a Fire Yellow, Red, or any red variations like Sakura Fire Red, Painted fire red, as well as Pumplin shrimp or Orange Sakura, and lastly Blue Velvets.
The Neocaridina shrimp which are sometimes referred to as "Neocaridina heteropoda" are the same as the Neocaridina Davidi, there were some changes in terminology but they are the same thing. The differences in common names mostly refer to the color quality/saturation and coverage.
