I am doing a paper on Pomacanthus imperator. I have a few things that I can't seem to find in the litterateur. Do you know if the imperator has the ability to change sex? I know that at lot of its relatives can do this trick but I can't find a reliable source that can tell me if the imperator can. Also I would love some nice pictures of male and female side by side. I have been told that they are almost impossible to tell apart but that there is a slid difference.