Getting irritated

[BW208]

Idk if it's just cause my tank is new or what but seems like I've always had an issue keeping sps color. They grow well and always have good pe and look good but they all turn lighter in color and/or brown. I've been doing a lot of research on it. Most people say it's because of excess nutrients. Maybe I need to more often water changes. My main Paramus are all in good shape but maybe the trace elements aren't prevalent enough. I usually do a 5 gallon wc every 8-10 days. The whole system is about 30 gallons. Any ideas? It's starting to really get to me.

 

[Reefing Madness]

Lighting would be one guess
Phosphates being above .05 would be another guess
Nitrates above 2

 

[BW208]

ATI 4 bulb t5ho with new bulbs. Where the sps is its 300 parI. Running a reactor with gfo. And I have zero nitrates