Now that the tank has been running for about 1.5 years I have started to find the sweet spots for each measurement that seems to make most everything in my tank happy.
Here are my current readings:
Salinity: 1.026
Calcium: 455 (420 to 450 is my target zone)
Nitrates: 4 (this is as high as I want to let them get, I have found that my tank does better with Nitrates around 2ppm. Nitrates of 5ppm begins to cause problems in my tank)
Phosphates: 0.12, using Hanna Low Range Meter (I may actually let this climb closer to .2, I recently added a large amount of high capacity GFO that stripped a lot of phosphates, causing unhappiness and pale color in some acros, they are recovering nicely as I let phosphates slowly rise)
ALK: 9.4dKH (8.8 to 9.4 is my target zone)
Magnesium: 1350 (I have found levels closer to 1400 to 1450 seem to be best for my tank)
I will also add that I do 25% water changes (50 gallons) each week. In my opinion this is the single most important action I take in keeping my corals happy. If I start to slack, it does not take long to see the consequences.