My phosphate tests have been reading 0 for the past 4 weeks. The thing is, I don't believe it. I'm still showing some nitrates ( about 2.5), and I have done nothing too different lately. The cyano is there but not much. This also coincides with having picked up a couple boxes of new reagent. I went back to the LFS that I bought the reagent from and he tested a sample of my water and came up with the same thing. He also mentioned that surprisingly, his home aquarium came up with 0 phosphates. I also tested my wife's nano and came up with 0 phosphates. The nitrates in her tank are 10 and I haven't been changing the filters lately as much as I should. Her tank should be showing some phosphates. I using phosguard at about half the recommended dose. Just wondering if anyone else has used a newer hanna reagent and their thoughts on the results?