Corals with symbiotic algaes as well as macro algae need regular daily periods of darkness. Being photosynthetic they have different processes they must carry out during cycles of light and cycles of dark. Like fishbait said, the best you can do to stabilize your tank through lighting manipulation is to run a reverse cycle in a refugium containing some photosynthetic organisms such as macro algae or light loving corals with symbiotic algae or coraline encrusted live rock, in that order of preference. This will greatly minimize your pH swings (between night and day)and lower the carbon dioxide levels at night and increase the dissolved oxygen levels at night.