Crab in Acan...ID?

[GoFish]

This was about a month ago just too busy to post pics

Found this little guy in an Acan colony after the lights went out. Everything that goes in the tank gets dipped in Coral RX or Revive but it snuck through somehow. I was having a bunch of Acan colonies die just before i found him, not sure if its related.
And havent had any crab in this tank besides hermits.

Its no longer with us (RIP) just wondering if anyone knows what it may have been