in my qt tank i have frags of zoanthids every morning i wake up i find them in strange places in my tank. also somehting is fragging the zoanthids i find like 3 or so poylps placed as if i did it. what animal moves stuff......
Crabs mostly. What kind do you have in your tank? Sometimes you will have a hitchhiker that you don't even know about. I think Shrimp will do this too sometimes but let's see what others say.
You still may not be able to find it by turning over the rocks, it is probably hiding in a hole or crevice.
Different crabs do move things though, i was in ***** (getting bird food, not getting fish
) and there were some crabs in a tank that ripped a blue sponge to pieces and were wearing it as hats.