Some disagree with anemones in reef tanks. I, on the other hand, house a beautiful carpet anemone in my reef tank. It has grown from smaller than a salad plate to about 22-inches in diameter. I am careful to keep my corals away from it. I have had several different anemones and like the carpet the best. In my experience they tend to move around less. Once settled they are there. When I got my new tank about a year ago, I dug a hole in the sand and put my carpet anemone's foot in it and he has been there every since.