They really like cherry shrimps once they get a taste for them. Have a look at <"Are there any Dwarf Cichlids.....">.here's a video of them hounding a poor shrimp
Realy!?.. Well i know this wholesaler states the origine of the fish, if it's not labeled "wild" it is tank bred.Tankbred ones can apparently. You can try cacatuides colormorphs.
Depends a bit in your setup.. I kept hunting barbs with the cherries and they got regularly hunted and eaten.. Just make sure you first start out with enough shrimps.. Give them cover and dense patches of moss to breed. This is where the fry will hide out and survive. Once you have enough Cherries than 1 couple (As i understand that is usual Ram setup 1 couple) of occasional shrimp hunter are not up to the task to eraticate them all..I'm guessing the answer would be no.