I've had a pair for a couple of years now. My female is much larger than the male, and the female has the spine on the gill cover, and the male does not. I suppose that is why the maroon or yellow stripe clown fish is also sometimes called the "spine cheek." Also, the female's stripes are more yellow than the male's. They are very active, but not mean. Of course, they do chase my clown tang and checker board wrasse from time to time. I do not presently have any anemones, but when I did, both fish enjoyed rolling around in them. Now, only the smaller male rolls around in my big palythoas. I purchased them from a store where they had just come in from the airport in the same bag together. They never fight, but seem to be pretty good friends.