It is super cute that your fish haven't harmed the ghost shrimp. However, once you've plopped down money on the RCS or Yellows, I'm sure they will go on a feeding frenzy.
THe idea here is you don't keep any shrimp with fish you're not willing to lose completely. If you intend to KEEP shrimp, a tank with fish with mouths isn't a good idea. THey'll eat the babies for sure. And if they eat all of the babies and harass the big ones, in a short amount of time you'll have nada. zilch. zero.
Hope that helps.