Few things to remember before you decide on the pay scale for your employees
Do they have requisite qualification to perform the job?
Do they possess the skills to perform the job?
Do they have and added benefit than the others and are capable of taking additional responsibility?
Do they intend to stay with you for a long term & will they make such commitment?
Many factors like above help you to determine pay scale for your employees.
You must screen the candidates for their unique abilities that can help to improve performance and patient care in your practice and that is most important factor when one decides on the pay scale for the employees.