Cleaner shrimp

[ogopogo]

So today I moved out a few piece of rock out of my nano to help seed my new 55. My levels are still all good, Nitrates are around 10PPM thats the only thing high. Everyone is doing fine, except for my cleaner shrimp found him on the bottom of the tank dead, I don't know if maybe he got to close to my pistol shrimps cage and got whacked, or if he just got to stressed? Any idea's? I've had him in the tank for about 7-8 months now with no issues before.