I had the exact same arrangment and got 2 fireshrimp. Both the FS were killed, then the 2 cleaner shrimp, leaving the CB shrimp to rule the roost. I never saw any of them being consumed, and I do have a 4" Melanurus wrasse. I have seen both the wrasse and the CB shrimp attack hermits, but never one of the other shrimps. So I don't really know what occurred, but with the CB still living fat and happy, he is on my A list for the perp.!