Mine sees to mysteriously move to another spot when I place him somewhere I just can't seem to find a happy spot for him. I don't see it moving I just see it's moved after the fact. Something could be knocking him off, I don't know.
I had quite a few move around after I first setup my tank with all the LR. Since everyone found a place they liked, they generally haven't moved.
Scatcat said:This one appears to be moving. I don't mean swimming around the tank, but he straightens his tube and curves around things with it. Looks like he's scooted a little further back. He's the one one that could have done that one. I don't know.