Yep, that one had "turned" and he was relocated to our lfs where he and a beautiful maroon and beige frog fish got up front and personal!! LOL
On the other hand, we had several that were in our tank and bothered nothing until Harley bothered them to their ultimate end.
Most crabs are hit and miss, except procelins, which we have none of due to.........yeah, darn that Harley!!!!
Sometimes you luck out and they don't bother anything....othertimes they devour everything except what they are supposed to!!