Hi not OP here but an extremely similar situation. I'll try and post pictures if need be. So I have already had a Tomini Tang in QT 5 days with therapeutic levels of cupramine. After seeming fine the past couple days and what looked like ich to be dropping off as I can't really see any more white salty spots on him. I came down this morning and he's got white splotches on the sides... Everything I see it seems like it be an infection. Would doing a freshwater dip be to much? Or what? Sorry for the wall of text.