don't bother with starting and stoping skimmer la.....the risk of the pump spoilt is more expensive then the $ save on electricity, for some skimmer, it takes time for the skimmer to build up its form, so mn a efficient basis it might not be worth it too....focus more on chiller (more effecient chiller, higer temp), lights (maybe one of those LED or T5) even return pumps and wave maker (simplfiy your rockscap to maximize on flow)....all these also depends on the state of your tank....if it has matured significantly, you can start reducing all this SLOWLY over time.....
over the course of 2 years i have increase temp by 1 degree, reduce my return pumps from 100w to 50w, stop running my wavebox and also a tunze pump.....all these without any noticable effect on the well being and growth of my SPS...