your anemone is an ok color. typically stress causes bleaching, say from collection and shipping. the anemone will expel its symbiotic zooxanethellae in its tissues, the algae that provides photosynthesis and nutrition to the anemone, giving it a pale or even white appearance. in time, with good intense lighting, your anemone should take on a much more rich color.
as for feeding, feed appropriate sized piece depending on the size of the anemone. alternate your feedings, they like nutrition just like we do. it looks like your anemone will take whole silversides. so keep things around that size.