The problem is when fish sleep. While awake, they generally know better and avoid anemones, however it's when they "sleep" that it becomes an issue. Fish sometimes drift at night and can get caught up in the tentacle of an anemone. Once they do....they are food.
Personally....I'd dump the condy and keep the mandarin. Speaking of food...I hope you are supplying the tank with pods to feed the mandarin.