Hi guys! New reefer. 55 gallon, params were great, I just recently put all my my fish in a QT tank bc I thought I had introduced a yellow mimic tang that I (sadly didn’t qt but will do forever from now on!) suspected had ich and died… my rusty angelfish soon was covered in hundreds of white dots that I assumed was ich (or velvet) as well. Rest of my fish are all In qt and seem to be doing well, all happy, eating after ttm and copper treatment. But my sailfin tang has had these white patches on him, just looks like discoloration, or fading color, not excess mucous. Do you think it’s a disease I’m not treating properly? Seems healthy other than the aesthetics of the patches which may be from him rubbing rock in the DT, but now I’m worried. I know pics aren’t the greatest… but Any tips would be appreciated! Thank you!