I just bought a Hannah Phosphate checker and my numbers are reading 1.57. I ran GFO in my media reactor for about 4-5 months. I have no algae growth in my tank except for the algae that grows on the glass. I checked my RO water and its reading at a 2. I'm using Fritz salt. I have a Apex Fusion that my ORPs are reading at a 37. I'm losing my ACANS went from amazing to almost dead. My water tests are perfect. What should I do.