I am trying to figure out how to get my SPS to color up in my 75g tank. They are all rather dull brown and green. I'd like some help to figure it out. Other than the blah colors, they're all growing and polyps are extended beautifully. My Softies and LPS is doing amazing, bright and growing. The only thing that I see is "wrong" with my tank in my testing is my Nitrate is high at 40ppm. it wasn't always this high, it went up when I added my auto feeder. I cut this back thinking that's the culprit as nothing else has been added to the tank. Additionally I am upping the water change to bring it down more. (I believe the autofeeder is the cause) Nitrite-0 Nitrate- 40 Phosphate- .25 Calcium-470 (dosing) Alk- 7.8 (dosing) Mag- 1600 this spiked recently) Ammonia is 0 Salinity .025 PH- 8.0 Lighting is 4-ATI Bulb (2 blue+, Coral+ Purple +) and SBar Actinic. 30 gal sump, running skimmer at night and recently installed Carbon reactor (about a month ago). Macro (including chaetos) always grow, then die on me (you'd think with nitrates, they'd do well). I was supplementing with this https://www.bulkreefsupply.com/coral-system-500-ml-package-korallen-zucht.html But after over 3 months of not seeing any changes, I stopped it. Can someone help me with coloring my SPS? Do I need better lights, if so, which ones?