Crab id needed

[Miltonic]

so I recently started seeing this weird crab roaming around in my tank and I have no idea where it came from, the only crab I added to my tank was an emerald crab that I haven't seen in forever but this can't be it since it's not green at all and it looks kind of vicious. I wanted to know if Its safe and leave in the display or move it to the sump.

best pic I could take of it while cruising on my Pectinia :/
[Only Registered Users Can See Links.]

[unleashed]

Looks like a bad one.

Nearly all bad crabs are hairy like your one pictured

[Miltonic]

I suspected this one wasnt a good one just by looking at it, it has this very red eyes that are just so creepy looking. It's going down to the sump for sure even if I dont have an exact id.

[Psst_copher]

i had two similar looking crabs invade my tank in live rock i presume. they continued to devour my other inverts, a few snails and my emerald crab. i actually saw him eat the emerald and it was brutal, i couldnt reach to stop it. i would get that thing out asap