I moved a couple of pieces of LR the other day and seen this sticking out the back side of a rock. It's stalk is about 2" long and the head is about the diameter of a half dollar. I figure it's some sort or anemone, but which one?
Don't say that bad word. That's kind of what I was thinking, but what I have seen before is a bunch of little ones. This is the only one (that I know of) in the tank and it's pretty good size.