How weird are my chicks. 12 weeks old and dont show ANY interest in anything other than their growers mash and chic seed 1. I had hoped to get some plain yogurt in them today as they have diarrhea from meds but it was a straight fail. Left it there for ages and even put a bit on beaks and there was no interest. Could it be because they are young and have only ever had mash and seed. Any other ideas to help tummies?