i have a maroon clown or sometimes refered to as sumartran...i was wondering if anyone can explain this behaviour...sometimes ha leaves his anemone and swing to the gravel at the bottum of the tank and stirs the gravel by swimming really fast while holding himself in the one position with this front fins...he stirs the gravel making the tank a little mirky in that particular spot, then satisfied with his job returns hoime to his anemone, is this common and why does he do this??