Ok, do I need GFO? I clean my glass everyday, if I don't then it has a this algae film on it. Test my nitrates, no phosphate kit, and they constantly read zero. I blame that on algae and the cheato in my sump. I feed a cube of PE Mysis, some other frozen food, spiralina, Formula 2 flakes, or pellets once every 3-4 days. I skim, but it doesn't pull out very much skimmate. I dose epson salt, ReefFussion 2-part, VitaMarin-C. I used to dose AquaVitro Ions, Calcification, eight.four. I feed my SPS fuel and Marine Snow every other day, alternating between them. I do 30gal w/c every week. Used to use Salinity, now SeaChem ReefSalt (needed to do emergency w/c and LFS doesn't carry Salinity). Thinking of adding AM GFO or a DIY GFO reactor. Any thoughts?