Well that went fast. Without GFO
on, phosphates shot up to .11 in about 36 hours. I put about 1/2 of what was in the reactor and turned it on again.
As for lighting, I have a couple acros high up in the tank that have lightened up quite a bit since getting them in the last month or so. They are still growing/encrusting on the rocks and showing polyps, but the reds have lightened up pretty significantly.
Like Greg said, having a good idea of where things generally stand as far as lights go is more the point. I think getting the LEDs dialed in on this tank has been a bit tough given that it is so darned shallow. Top of the sand to the water line is ~9.5 - 10.5" depending on piles the pistol shrimp has decided to make that day. So I'm thinking that two non-dimmable Onyx fixtures that were roughly 12-14" above the tank which is 48" wide x 18" deep x 9.5-10.5" (sand to waterline) is a ton of light.