Well on a sps tank a water change every week is mandatory , 10 to 20% a week.
What a lot of people don't do is check your cal , alk and mag daily . Any swing in any of the 3 is no good and will stress the sps out. Temp is also a key factor a 1 to 2 degree swing the most.
Light cycle is a key also , to much light will stunt growth and loose color (bleach). To little light little growth and no color (browned out) . As for
Dosing , unless you are running a ultra low nutrient system then you dose to feed sps. If not a uln system and dosing will just cause a nutrient problem in your system.