Crab Attack!!!

[dochoot]

I have TBS rock and there is still a gorilla crab that I can not get rid of. I was sitting in front of my tank and saw a flurry of activity. It was a previously healthy small cadinal with crabs stuck on it still alive. One was the gorilla and the others were little blue legged hermit crabs from a clean up crew. I assume the gorilla can kill a small fish? Can hermit crabs? I was very surprised. Just previous to this the cardinal seemed normal ie not sick or lethargic.

Anyone have an experience like this?

Thanks