phostphate

I have been dealing with high phosphate recently, I've been running a rowaphos reactor to try and bring the levels down but I just tested my fresh saltwater for phosphate and it says that the water has .08 phosphate in it. Where would this come from? My ro water is testing 0 tds and I am using...

my hannah checker (low range, not Ulr) alway show 0 phosphate. I’m running GFO (1/2 recommended amount). Could 0 phosphate make my acro unhappy? How to raise it up ? No3 reading at 0.75 Vinegar dosing 1.5ml daily, Dosing AA Another thing to mention, I have 1 mille frag, doing well with polyps...