If its small enough to be knocked over a tuxedo is likely to just pick it up. They'll carry small unattached frags, individual polyps, pieces of rock, shells, and bubble algae etc. I even had one carry around a dead fishes skull for a week a few years ago.
But they are great at stripping all sorts of algae off your rocks. If you add too many they will keep your rock almost completely bare and white. I have several in my refugium to keep the hair algae that grows on the sides in check. They seem to leave the gracillaria and chaetomorphia alone.
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