nitrate rise in 1200 gallon

In my 1200 gallon system my nitrates are rising. I'm am startING to feeding less and have been doing 120 gallon water changes every third day. Any other suggestions to help let the levels? Also my phosphates are slowly creeping up. I use RO/DI water and salinity reef salt by Seachem. I have two small media reactors with nitrate media. Five reusable media bags, four are filled with nitrate media and the last one is filled with phosphate media. Tank has some coral and I noticed that my tracophylia brain has lost color and seems thatitis not eating. Other corals look good some even are growing!



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http://ift.tt/1D7FbEs What my tanks look like



http://ift.tt/1CLgdgy From second floor looking down on fish only tank (700 gallons)



http://ift.tt/1D7FbEw Refugium on display (part of fish only tank)



http://ift.tt/1CLgdgA Spill down from top reef tank to bottom fish only tank.



http://ift.tt/1CLgaBr Pumps, stumps, and skimmer.



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