I just noticed yesterday that something is wrong with my Sailfin tang. He has been in QT for just under 13 weeks, and has delevoped what appear to be dark splotches on his abdomen, about 1/4 to 1/2 " in diameter on his abdomen. His fins have been a little frayed aswell, I assumed it was the 2 clowns that are picking on him a bit as they have become a little aggressive since in quarantine. They are the culprits as of now anyway. My newest addition to the Qt was a metallic goby, who was moved saturday because somebody ate his tail fin off, again assuming the clowns for this. Any ideas on what my fish has now?