My Chevron has been in quarantine two months along with my two clowns and three fire fish. The were all treated with copper the first couple weeks. Everything has been fine until a few weeks ago. I noticed little brown welt looking spot on my white clown, went away after a week or so. Then my orange clown same thing brown welt on the side, after a week or so it went away. Now my Chevron Tang is showing the same brown looking spots. What is it? Should I treat the quarantine tank? Seems to have went away after a week or so on the clowns. Just more worried about the Chevron Tang$$$? The worm looking line running from the middle to the tail.