Advice needed

[wreck]

Tank has been set up jan 2013 It doesn't get direct sunlight, I am using rodi just changed the pre filter and carbon 2 weeks ago, di is still good, membrane is 7 months old.

I was thinking about more water changes

Running 2ai sol blues, blues on from 10-12 am blue and whites on 12 8 and 8 to 10 blues.