Which formula of Harlad are you using?

Are they also getting adequate ventilation? There was another poster on here who had a litter with very red skin and patchy hair and it cleared up once he moved his tanks around and got a little better airflow.

Also what color are they? My RED's always spend a week or so looking thread-bare with pink skin when they start losing their baby fur and growing in an adult coat. I never see that kind of pinkness on the other colors.