I think, if we have parameters from the locality of C. simoni – as given in the link I posted – of ph 5,2, 6gh 1kh / 62 µS – it’s without doubt soft, acidic water they prefer, and nothing else. Additionally, they are observed to live together with C. fernandoi, which like to hide in leaf litter and peat – this is also a clear hint for a similar habitat as for some paros. Not brackish water – by no means!
And I think it is not a matter of costs to decide if we try keeping paros and these shrimp together ……… It’s not my attitude to pit the risk of losing animals against the price I paid for them ……. Life itself has absolutely the same value for every creature, no matter what prize we pay for it ….