might be trying to scare you off.... or hes trying to find some food.. whitch would float up.
to be honest with you, i have a maroon, and its bta moved to the front side of a rock, and its tenicles graze the substrate. well ever since it moved here, the maroon has spent every waking moment for 2 weeks moving gravel from under the anemone.. so much piece by piece theres no a 2 inch dip. yesterday.. she figured out how to do the tail wag thing, and shes gonna reach glass soon if she doesent stop!