we have four ducklings that are about eight days old. we bought them last Tuesday at TSC. there are new chicks in at TSC today. so they're about six to seven days younger than our ducklings. is it safe to put ducklings in with chicks that are a week apart in age? or will they peck the chicks? also, there's the food issue - we feed non-medicated feed to the ducklings, and the chicks would need medicated feed. it would just be a temporary set up, until this evening. would everyone be safe or should I not buy the chicks?