Well reducing the number of hours could help with algae growth but not tithe level of success that you would get with regular water changes so I would just leave the lighting schedule as it has been... Plus if your coral gave got use to the number of hours of lighting then they have got in to a routine as well so I would say not to change that.
Have you got any bio media other than your live rock? And how much of live rock do you have in your tank?
Have you got any bio media other than your live rock? And how much of live rock do you have in your tank?