tang help --- uhh

So i have a 3 inch vlamingi tang who is a week old today in the tank. The tang is very shy, but eats all the nori, lettuce and mysis shrimp i put in the tank (basically eats very well). However, the two side fins that it uses to swim are starting to get cloudy (took pictures but it is hard to distinguish). I have a 30 gallon tank empty with extra heater and powerheads and also have copper sulfate and test kits. Should i set up the quarantine tank and put the tang in there or should i wait to see if the tang starts to have other symptoms like scratching, loss of appetite etc...

Parameters are fine except nitrates are at about 10-15ppm.

To set-up quarantine, this is what i would do; correct me if im wrong.
- Take about 15 gallons of water from the display tank and put it into the 29 gallon. Put the fish in there directly and then treat with copper appropriately?

PLEASE GIVE ME SOME SUGGESTIONS.... I love this saltwater hobby but its soooo difficult at times..

 

I have treated fin rot successfully with garlic and melafix soaked food. Pretty much my cure all with my fish. When ever there is a problem, I bring out the garlic and melafix. Then let the fishes' own immune system take over.....

 

I do not believe this to be ich or velvet alike... The fins are becoming cloudy on the fish so does it mean that it is fin rot?

 

+1 on the garlic

 

Ph or Nitrates are causing this unless you actually see some bubble like nodules in the fins or they are looking frayed ? Tangs can not take NO3 like that. They require water better then most sps corals , Hence the term Ich magnets and sickly fish and hard to keep and all that crap.. get the Ph right and or lower the NO3 test all the parameters of the water . Its the pectoral fins