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Yes I have tried brs two part and it certainly is more diluted I was dosing about 100 ml with brs now with esv I’m dosing 50-55 at the moment maintaining alk at 7.7, I do believe lighting and nutrients have been unstable for quite some time as I was trying to figure out the whole nutrient algae issue. I will try to stabilize those main components. I don’t want to change too many variables like two part dosing solutions as this will most likely create more set backs and possible losses of coralsIsn't ESV more concentrated though? Seems BRS was pretty diluted. I know a few sps keepers with stellar results who swear by ESV. I think you are struggling with consistency, nutrients then lighting. Pick a spectrum that is visually appealing with ample par and leave it be. Consider that maybe you ramp time is too long and essentially not stable, its constantly changing for 25% of your lighting schedule. Get your nitrates to 10ppm or under and maintain a steady value. Focus on ALK stability, temp and salinity with calcium and magnesium being in a acceptable range. My sps responded as well to oyster feast as any of the pohls products. I feed at night, seem to get a better response. I mix mine with reef roids but I dont have much of an algae issue. Read up on the relationship between light, alk and nitrate values. Higher nitrates seem to do better with a higher alk and par level.