Do you mean the anemone is unattached?
If attached leave the anemone be unless it's in danger from wandering into power heads. An anemone will find it's own spot.
If unattached you can place the anemone in a lower flow area, place a strawberry basket it over it or take a wide diameter pvc pipe and place the base/foot in the pvc.
How deep is your sand bed, and LTA should have a nice 2 inch sand bed.