maybe cut the GFO down in half. what does your current lps look like?GFO. I do a water change every 2 weeks, about 30%. I was over feeding intentionally to raise the phos and nitrate as both were 0, added the GFO to drop them a little as they got a bit high now both back to 0.
Maybe reduce the amount of GFO?
Add suppliment 100% reef safe aminos
interesting it shouldnt be grainy , send me one of your raw files i want to have a look email to matt@imagewithdesign.com.au100-200