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i have seen the best results when my no3 is between 16 and 32 and my po4 is between .04 and .08 i am not claiming to be an expert so maybe they do look better for others at lowers levels. Im just sharing what works for meI’ve seen quite the opposite regarding color and health when they’re high of levels as you suggest. In fact, I see better coloration, health, PE, when levels are low, in my own and many seasoned hobbyists tanks. I’m sure we all agree you need some, but not double digit NO3 or residual levels that high.