My urchin does occasionally pick up rubble, but hasn't moved any larger items, and my rock structure is not glued together. I do glue down my frags though, and it hasn't moved any of them. It has taken one of my clips off the glass that held the algae strip and hid it under a rock on me. I don't have clams, but do have anemones, frogspawn, blastomoussa, an open brain and branching hammer corals, and it doesn't bother any of them. My frogspawn, brain and hammer's are not glued down, and it doesn't move them. It has carried a couple of snails around and some crabs, but put them down after a while. It did clean a little coraline algae off my conch, but didn't move it.
I also set up a refugium with chaeto, and the algae was slowly dwindling, but the urchin sped things up for me. I think that I had corrected the problems that led to the algae, but just couldn't get rid of what was there. At least not fast enough for my liking.
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