They are getting more and more common. They are not truly an anemone as many envision. It is actually from the mushroom family, and not an anemone at all. However, due to its appearance, it was named accordingly. Many have found these scattered throughout their tank, usually closed up all day long but opened up at night when the lights are out and then freaked out.
The main identifiable ball anemones come in a variety of colorations with the white-tipped ones being the most commonly observed in the reef tank. They are commonly mistaken as Majano anemones and many treat them as pest anemones, although they pose no real threat to the aquarium other than thriving in it.
