The nitrates checked out 0, his phosphate readings were a little high, now they are O, My TDS meter says it is 7-8 , his filter age is unknown, He's running a HOB fuge with cheato, he cleans filters once a month. His fish load load is 2 damsels,shrimp,serpent star. I believe the tank is 5 years old. Some of this might be inaccurate . Maybe he'll chime in tomorrow. Thanks for your input.. Wayne