Recently I purchased a Male Mandarin Dragonet and put into my tank. I didn’t QT because I read a lot of threads saying this is a fish they don’t QT and I have a female that I didn’t QT and everything was fine. Turns out 2 days later he is covered in spots, then the spots go away and he develops this batch on this right ride on the top of his fin. It got white and looked like it rotted away and his skin slide off his body. I took him out of the tank. He later died. I’m assuming now I have Brook in my tank. I just noticed some flashing on my clown fish. Should I take them out and run them through a copper treatment and wait the life cycle to re add them to my tank or should I just wait and see what happens and make sure they keep eating and fight it themselves. I know that is what to do with Ich, not sure how Brook works. Thanks for your time.