Well I tried posting an update yesterday, but the site was down.
I've noticed, what appears to be some kind of an erosion, appearing around his eye and head. I'd say the color is a lighter orange. I've included a photo with some circles around the areas of concern. Sorry, it was the best pic I could get, he wouldn't sit still enough. Is this anything to worry about and if so, what would it be?
Throughout the day yesterday I never saw him chow down, but he did pick a few times. His behavior is about the same. Could it just be the size of the QT tank or maybe the copper? I have a 20L partitioned off in the center, so he only has a 15" x 12" area. I was thinking about partitioning the tank the long way or corner to corner, allowing a longer swimming area. Do you think this would help? He was at the LFS for approximately 3-4 weeks in a tank not much bigger than the area he's in now.