My tank has been fully cycled for 2 weeks now, I have some fish in, but my phosphates, as measured by the Hanna tester, measure at 0.00. I am not shocked at the reading because I have zero algae in my tank, but it is surprising as my lights have been on for 12 hours a day for 2 weeks. I put a carbon reactor a week and a half ago, but no GFO. How can it be that I have 0 phosphate? Is it normal? Should I be worried? Thanks!