As you can see from my pictures in the corresponding thread, I keep White Pearl shrimp (Neocaridina cf. zhangjiajiensis var. white) with my P. nagyi.
They are said to tolerate a ph-level around 6,0 – so I tried it. They now live in water with a ph-level of around 5,5 – and they do quite well.
I keep different kinds of freshwater shrimps in all my tanks with different fish species – and I highly appreciate them. They do a lot to keep the tanks clean – and if they are doing well, they are very reproductive ………. and the young provide a good food for anabantoids and blue perches.
Another shrimp species which is said to tolerate a low ph-level of about 5,2 is the Sri Lanka dwarf shrimp, Caridina s. simoni. I do not keep them yet because they are infrequently on offer – but I aim to buy some as soon as possible.