I have had very good luck with zebra and yoyo loaches with my cherry red shrimp. I have a 50 gallon tank full of lots of moss and plants along with swordtails, mollies and the above. I never see the loaches or the other fish going after the shrimp and they seem to be increasing in population too. I do keep the fish well fed and guess I been just lucky with them. I would at least try a few CRS and see if they survive. Be sure to feed well a couple days anyhow. I've had my CRS for about two months now.