Help my Blue Tang please!!!

[mysaltyfish]

I'm so worried about my new Blue Tang! I received him/her 2 days ago (ordered online). Today I went to see my fish and it had some type of erosion under its fins.

I have 1 picture that is of reasonable quality: http://picasaweb.google.com/mysaltyfish/BlueTang?authkey=Gv1sRgCJi9vYTooOeYrwE#5383304266289129650

It's hard for me to take photos, but I tried. I also took a video and posted it on youtube: http://www.youtube.com/watch?v=LH1sHcXxDxE

Please help me identify this. Is it ich? Something else? What should I do?

BTW, Yesterday I started Cuppermine treatment, so the water has half the treatment amount now (and the 2nd half is supposed to be added tomorrow).

Also in this QT is some PVC.....

 

[mysaltyfish]

I put in a neon goby and it's helping to nibble on it. The blue tang likes it when the neon goby is eating away now.

 

[mysaltyfish]

It keeps rubbing its body on the PVC. Is this bad?

 

[mysaltyfish]

And then it lies flat for the Goby to eat away

 

[mysaltyfish]

doing better after some treatment meds.