I agree w/ Chaswood. If it's really that low light SPS will slowly but surely die.I made the same mistake having 2 Kessil 160s over my biocube. That was my first set of LEDs, and I didn't want to burn them. When I finally got a par meter in, I had like 100 par 3/4 of the way up lol.... i LOVE the look up LEDs, but they are so much harder to dial in. They are not plug and play like t5s
Lastly, I have to disagree with the nitrates. There's some things that science hasn't figured out in our tanks yet. Conventional wisdom says "just enough nitrates." Granted, I have a LOT of expoert, fuge, skimmer, vibrant, filter floss and WC....BUT, I dose my nitrates from 10-25 and I prefer the 20s... Acros, LOVE it and the colors are so much better, it's not close. Prior to that I had consisetnly 1-2 ppm nitrates and no dosing. Conventional wisdom also says SPS probably don't eat phytoplankton, but I dose that and they're much hairier when I do...go figure