Stable water parms is the key to longevity for sps and pretty much everything. The first things you will need to have imo.....is an ato and good stable heater/controller. This will stabilize your salinity and prevent big swings in temp in the tank. This is just the basics to get started. Sort of the ground work sort of speak. Without these being stable there is no need to try and stabilize your supplements yet.
Personally I do not do water changes on aquariums for nutrient import/export and water quality. I use reactors, skimming and auto supplements, etc to keep water parameters where it needs to be. I check once a week at minimum on parms to make sure they are within range. This is the key no matter which method you prefer is constant checking. You can get it down to a science after a bit and it doesn't require as much checking. This is a personal regiment you can setup yourself.
Once you get these under wraps. You can keep whatever you want.