I was the one that had a problem with the bicolor. It nipped at a large clam that I had at the time. It didn't cause any real damage to the clam but it kept it partially closed. Other than that, it was a great fish. It didn't bother anything else. I had LPS, SPS, and soft corals at that time.
I have, so far, heard of noone else having the problem I had. All fish are individuals I guess. Mine never dug either. He spent his time in a small hole in the rock and would dart out every few minutes to get a bite of algae and cruise the tank. Then it would back into the hole again. I am pretty sure you will be fine with one.
John