I don't think you'd find an acro crab outside an acro.Just a thought, but with the size and coloration of this specimen, could it possibly be a trapezia acropora crab? If so, no worries. The spots and claw structure is what makes me think that it may be so. Thoughts peeps?
You can find them walking around the tank. Sometimes they find acros that they like a little bit better for whatever reason. I always thought they were lifelong dwellers, but I have witnessed them move around.I don't think you'd find an acro crab outside an acro.