swings

Hi All, I`ve been in the hobby a while now. I have had good success with Softies and LPS but when it comes to SPS I just dont seem to be able to hit the sweet spot. Tank is a DD Reef-Pro 900 (290 Litres total system), I have a Radion XR15 (Blue) at 100% on the AB+ Setting, 10% water change every...