Usually, If your basic salary is less than 7500, they will reject your family visa and call for interview, however, after 2-3 attempts you may get visa depending on your company cooperation. It is better to negotiate for increase upto QR 7,500, also ask them for medical coverage, utilities, etc. However, QR 6,000 is not bad salary, you can live easily with your family in this amount if housing is from company.