If you are talking about a club tipped anemone, I believe it is a cold water animal. It's not actually an anemone. It's a mushroom. It also has the largest stinging cells there is. They also reproduce asexually like other mushrooms.
I have a friend that had some in a cold water tank a long time ago, but I have never kept them. Maybe someone else can chime in that knows more about them than I.