Posted by @fishx6 November 01, 2014 at 15:20 pm - 1 person found this useful. Hi Guys This is how we learn so keep the debates going! I actually think this is the Onespot Demoiselle (Chrysiptera unimaculata) because the spot on the back is in the right place and is more upright! Dark damsel - Pomacentrus aquilus has the spot in the wrong place. Correct me if you think I am wrong but this is where I have put the fish!