If they continue to stay pasty, then you are keeping them either too cool or too warm. I think it is too cool, but not sure. If they huddle together under the light, then it is too cool, or if they are in the far corners away from the light, then it is too warm. I would keep the one separate, so the others won't start to peck at the red area until it heals. Clip the fuzz, or put vaseline or mineral oil around the vents to keep poo from sticking.