Hey,
as Peter already mentioned I keep these C.parvidentata for about 7 years now. I bought them as C. parvidentata and hope they are. BUT I never proved because my shrimp taxonomy knowledge is too small.
As 7 Zwerge said: They reproduce very fast till pH of about 5. Parosphromenus seem to act different depending on species and other available food sources.
My P. sumatranus ate all the young shrimps so their population can´t grow. In this topic I have to correct you. They live quite a long time. I think 3 years is possible in good conditions.
The P. phoenicurus were not able to stop them, so the population is very large and there are always young shrimps in the tank.
I don´t really care if these shrimps are originally with the Parosphromenus. They do well in the tanks and are an additional animal to watch (if no fish is willing to show up).
Best,
Bennie