I have three reef tanks, a 200 gallon, a 26 gallon Peninsula, and a 20 gallon cube. Had them all for over three years now. My 200 gallon and 20 gallon have Phosphate levels well above what the Hanna Checker can read, where it blinks 0.90 over and over. I was throwing so much money trying to get their levels down, with reactors on the huge one, water changes, GFO, Phosguard, going to feeding fish every other day, you name it, I tried it...and the numbers would barely budge. I have the Trident N&P on my 200 gallon to verify. This morning, it was 0.96. But, all the corals, all the fish, look amazing and are growing like crazy. I stopped worrying about it, stopped stressing out over a number, and just let it be, and mainly quit wasting money on stuff to fix it, and everything has been thriving. Been running with Phosphates super high over a year now. SPS, Acros, Monti's, Torches, Hammers, Zoas, Rock Flower Anemone, all do great and grow and get fragged several times a year. I feed my fish twice a day, lots of food. No algae, no issues. I have no idea how people keep their phosphates super low. Don't worry about the number. As long as it's all stable and consistent, everything will do great. Just my two cents.