Need some help with browning out sps

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I'm running my temp ~80o.

I agree with the nitrates. I'm using an API test kit for nitrate. However, i have been using Red Sea for Ca, PO4, Mg, and alk.
I can definitely turn down the temp a bit as my heater does turn on momentarily.

Do you guys think I should be feeding anything extra for the sps? All I feed right now is mysis, sparinly mind you, and I spot feed my LPS once a week with mysis.