Large white spot on tang

[triten]

So I have a yellow tang in my Display tank. He sat in copper for about a week at an extreme dose accidental, before I put him in. He has a large white spot about 2mm on his fin it's been there for awhile now. I think it's lymph he pretty much only eats sea weed strips. Will it go away on it's on or should I soak the strip in something to medicate him? He is small between 2-3 inches.

 

[scooter31707]

hard to say without a picture. By the sounds of it, it may be Lympho. This comes from poor water quality which may have come from the overdosing of Cooper. IME, I have soaked their foods in Selcon or Vita-Chem and it went away on its own.

 

[triten]

I'm at work will post a pick when I get home.

Main display
Temp 78.5 - 79
1.025
Nitrates 0-2ppm
Ph 8.2

System is about 3 months old