I have had that problem with my tank. No matter how much I feed I can never get any nitrates. Without nitrates the colours of your sps will be pale.
I add NaNO3 to my tank daily to help keep my nitrates at 1ppm. You could try putting your skimmer on a timer to see if that helps. It didn't for me. I completely truned off my skimmer and still couldn't get any nitrates. I have added more fish and feed twice a day but still no nitrates.
If you choose to go the NaNO3 or KNO3 route be sure to monitor your phosphates because you can cause them to crash as I did. Zero phosphates is worse than zero nitrates. I have to add a little bit of KPO4 to help keep my phosphates from crashing.
Make sure to use a good nitrate test kit. ReaSea Pro is the best affordable option.
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