None, not needed. Save your cash and get a 1 or 2 part nutrient formula and good genetics. Give her the proper environment, and stay out of her way. Less is more.
If first grow, consider running in soil (larger margin for error), read about VPD, and research grow room design. Map out how you can accomplish the proper tent environment. Often times humidifier, dehumidifier, thermometers/hygrometers, and fans will be needed.
All of which you'll find find outstanding information for here at The Farm.