Copperband Not Eating

[Jaws]

Well, this is my third attempt at a Copperband. The first two developed a red, almost rash-like problem within the first couple days of being introduced to my tank. The first CB developed the redness around it's nose on each side and the second CB developed the redness on both sides of it's stomach. Their breathing increased very rapidly on the day they each developed the redness. Neither of the first two were eating or even showing any interest in the rocks. The third one is very active, not shy, and shows a lot of interest in its surroundings and is always picking at the rocks. I still cannot get him to eat anything though. Anyone else out there with a copperband that can offer some helful tips or tricks?