Ok let me clarify the size. When I saw it close into a ball, it was a little smaller than a hardball. When it opened, I would say it was maybe 4 inches across. I looked at my aquaclear filler tubes and at the bottom of them have opening about 1/16 inch open. I small piece of krill barely makes it inside. So I am staying optimistic that my anenome is still alive and just hiding.