Today I got an order in of 3 zoanthid rocks. They are different than what I expected, but they are zoos. The colonies are quite large, one covers at least a 6 inch area, yet the individual polyps are about half the size of the other zoos that I have. It is not that they arent open, you can tell this is how they are to be. Can someone tell me the name difference? As cute as they are, they arent really what I wanted to get and I would like to know as to avoid them in the future.