Hi all, I'm new here and need help with my Glass Cat

I noticed on Thursday that my Glass Cat had white spots all over him, I've had fish with ich before and this didn't look like what they've had, although I figured that since his body is see through the spots may look bigger than on other fish. I was hesitant to treat him for ich since he didn't show any other signs (flashing, etc.) and none of my other fish have any spots. I took a picture of him and took it to the pet store and the girl I spoke with believed it to be ich so I began treatment. Now 2 days later he's looking a little worse but still not showing any other symptoms and again the other fish are fine. I don't want to continue treatment for ich if that's not the problem so I'm hoping someone can help identify what the problem may be. Here are some photos, sorry they're rather blurry.

http://viewmorepics.myspace.com/ind...dID=69448117&albumID=2222673&imageID=33176501



http://viewmorepics.myspace.com/ind...dID=69448117&albumID=2222673&imageID=33176502


Just to give you a bit more info.:

We've had this aquarium for 6 months and haven't had any problems before now.
Ammonia-0
Nitrite-0
Nitrate-10-20
pH-7.2


Any thoughts would be much appreciated.

Thanks, I will