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I'd say that you can safely house them together. Since the cherry shrimp are a neocardinia species and the rainbows a cardinia species, they will not cross breed. I have the rainbows in with my yellow shrimp and all is well, no crossovers. The rainbow shrimp also breed quite readily if the conditions are good. My water is slightly basic with a gh around 8 no ammonia and no nitrite, obviously. I have them with lots of java moss and regular water changes with cooler water. I found that changing the water with cooler RO water induces molting, which induces breeding.
The only thing I found was that when I first got the rainbow shrimp, around 3 out of the 6 died within two days. I don't know if it was the shrimp, however, I also have to add that I didn't acclimate them at all, but just dumped the batch into the aquarium :icon_roll
Overall they are rather prolific and eat just about anything. I don't see any problems with keeping them in the same tank :) .

Good luck
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