A couple of quick questions. What color was the foot on the anemone? Also is it eating (silversides, mysis, flake, etc..) and staying attached to the rock? Was it sticky? If so, those are good signs.
I usually soak my silversides in zoe when I get a new anemone then place small pieces near the mouth. Depending on whether it has a quick feeding response you may have to ward off pesky fish who will try to steal the anemones food. Once the anemone strenghtens up the feeding response is usually pretty quick. New anemones can sometimes be weak and have a slow feeding response.
Best of luck!