Ok. First, you need to actually develop a plan. What you are doing now is going to kill your fish rather than help them. Seeing as you can't figure out what your fish actually has (it's not always clear because diseases and symptoms are similar), you should focus on what is most likely. The two most common diseases in our tanks are ich and velvet. Both of these are cured using the same exact medicine and method, which is copper.
Your fish will not live long with velvet, but it can go awhile with ich or flukes. My recommendation would be to treat with Cupramine for 14-21 days, followed by a week of observation. It might make sense at that point to move to other treatments, but let's get to that point first.
BTW, velvet and ich are easily passed to every fish in the tank while flukes are not. I would definitely do the copper.
Also, what is in your display tank right now? You have to have EVERY fish out of the display and in quarantine, otherwise you are doing this all for nothing and totally wasting your time.
Stock list:
1 Radiant wrasse
1 yellow coris wrasse
2 maroon clowns
1 pinkspot goby
1 tiny red firefish
the PT
all my coral and a maxima clam