I am really confused I set up my 90G tank with 30G sump last Friday with 150 lbs of dead rock I bleached and dried and 100 lbs of the bagged live sand. I tested the water for the second day in a row and have 0 ammonia and 4ppm of nitrite and 100+ppm nitrate. I been putting flake fish food in once a day. Has anyone else had this?