Well, these two have been nearly inseperable since I could start to tell the difference between each of the 5 angels in my tank. They happen to be the only two with red eyes, which I think is really cool... But I've never taken that to mean that one is a guy and the other is a girl... they just don't seem to like any of the other angelfish in my tank... at all. but last night really threw me off guard, as they suddenly started doing this wierd lip lock thing, for the first time ever. Now I'm hoping that I get the 20gallon they had at a raffel at my lfs last weekend...