Quote:
Originally Posted by reefwars
At 0.25 for Po4 , that's part of your issue 
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Probably most of the issue. Temp is good, other parameters good. RO vs RO/DI is not a factor. NO3 reading 0ppm is likely not an issue, there will be some, just utilized immediately and not detectable. I never had a reading on NO3 and coral growth was crazy.
I'd aim to lower PO4 as a first action.