They are normally pretty hardy (as far as anemones go), but bleached anemones are usually on their way out. No anemone is naturally white -- it means the photosynthetic algae (zooxanthellae) living inside them is dead. That anemones looks very unhealthy. You will need to feed it pretty heavily to get it to come back, because they cannot obtain nutrition from the light without zooxanthellae.
Carpet anemones are also the anemones most likely to catch and eat fish in their tanks, even their own clown hosts. They are very aggressive...