I have had this Emperor Angel for almost 10 months in an established tank that has been up for over a year. All parameters are within normal limits. No new fish in over 4 months. All other fish are perfectly fine but I have no idea what this is on my Emperor Angel. It's yellow looking and on the side of its face and developed a day ago. Started treatment with Seachem Metroplex and Kanaplex. Any ideas of what this could be and any treatment suggestions. All other fish in tank have no signs of any sores and are all acting fine. Emperor Angel is eating fine as well.


