Unfortunately anemones eating fishes is nothing new. BTAs it's less common, but in my meeting experienced reefers with anemones, they've all consistently told me that with a carpet anemone and some other anemones, it's not a matter of if they eat your fishes, it's a matter of when they eat all of your fishes, including tangs and other fish you'd never expect to be eaten by an anemone.
Sorry to hear your mandarin is gone
Hope the reefbrites are good. I should have a tank this weekend, so I'll update my thread and start a new one to keep you posted
