Hello. Got a Tomini Tang from Divers Den 5 weeks ago. Gave it a freshwater dip and Ruby Rally bath and it went into a sterile WT tank. The following day I noticed some white blotches under his mouth and along the underside of his cheek/gill (on the skin not in the gill). I did 2 weeks of copper at 1.8, then a week of Metroplex, a week of Kanaplex, Maracyn Oxy for a week (all per directions) and nothing seemed to do anything to the point I deemed it scarring as it never got any better or any worse. I stopped trying medications and was ready to put him into the display tank and noticed a few small spots on his forehead. The past few days they have become more pronounced, I believe them to be the same thing as what is under his mouth, whatever it is. At this point is this just caused by stress and water quality (you can only do so much with a poop machine tang and a 20 gallon long tank, I do 15% water changes every other day) or is this something else? The spots are not raised. I did a freshwater dip again before posting and nothing came off. He does not flash, eats great.