I have a new 75 gallon saltwater aquarium I literally set up a week ago, I put 30 pounds of white sand and 20 gallons of Live sand, I have two hang on filters and a heater. I tested my PH, NO2, NO3, Salenity, everything. And all test come back perfect. But its only been up for 8 days now. I expected everything to start high and work its way down as it cycles, but it stays 0 all the time. Any ideas?