Friend crab came on my rubble, anyone recognize the species?

[Old Guy]

I had one in my reef for a few years. It loved to eat my cleaner shrimp. The luckier ones would have an antennae snipped here or there, but it would get them in the end. Finally I didn't see it for about 2 years so in went a shrimp that lived for a long time. I used to watch it try to get hermit crabs out of their shell but I never seen it successfull.