So low nutrients,,, I agree there. I am running GFO 24/7. Was running carbon Roxx. But only use it ocassionally. I have cut my feeding back alot. Twice a week I drop a phosphate bomb in the tank witha little of everything to feed my corals and the slower fish that don't get as much to eat. I pretty much have the algae whipped at this point. I let it go on the back of the tank and rotate areas, I think it helps to keep it off the rock and sand. Any of you running GFO ??? I think that all of my corals look noticably better the next day after I feed with the frozen meaty foods. No doubt in my mind that it helps them. I put different kinds each time. Mysis, Brine, Emerald Entree, Squid, then I'll put 1/2 tspn Cyclop-eeze, I'll cut up some Nori for my big herbivores, plus crush up flake in smaller pieces for the smaller fish. I get awesome polyp extension on everthing. I individually feed my euphyillias, calaustrea, fungia, favia, plerogyra they like it and respond well.