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I found a small crab about the size of an emerald crab and of similar shape on my new live rock....tan in clot with faintly banded legs, is he good or bad!?
Hard to tell from the pic. Most crabs are oportunistic (sp) and will take advantage if hungry enough. I would catch him and either put in the sump or give to your LFS.
well, if you are adding one eventually, you can leave the crab in the DT till it's up and if he misbehaves, catch him and toss him in the sump. it will be a bit of a P.I.T.A. to catch though.