The reason I was asking was because I was running my lights intermittently for the sole purpose of when I am at home the lights are on for viewing. I must be honest, I am probably going to kick myself for saying this, but I haven't had and algae problem in that tank. Touch wood.
Start your tank's day later in the day. But make sure the total photo period isn't more than 12 hours. That includes not allowing any natural light into the room.