Ok... First, why are you adding chemicals? Is something low? Like calcium or alkalinity etc? I had my cube for a year before needing to dose 8mL's of B-ionic 2 part every night.
Also, I wouldn't add any "daily" chemicals at all. Your water changes should replenish enough. What salt mix are you using?
I use Instant Ocean Reef Crystals.
Oh and your light schedule should be ok. Most run 9 hours a day.
"When creating an aqua scape, strive for the beauty of imperfection, as its art and there is no wrong or right, it's left open for interpretation" James Findley