Definitely get them off the medicated feed. That is intended for short term use (if it's used at all). You can give them starter which is not medicated, or a grower which is at least 16% protein. I personally don't have a problem letting pullets have layer if they have switched from peeping to clucking. But... I'm in a minority on that stance!!!! If you stay with starter, pick up a bag of oyster shell, and put it out when they show signs that laying is imminent, or when they turn 16 weeks old.
