Newly setup red sea reefer 170 post cycle and my nitrates are at 100ppm (Salifert kit), decided to do a 70ltr water change over the weekned to help bring it down but it's still at 100ppm this morning. Ammonia is 0ppm and so is Nitrite. Tank has special grade Arg alive sand, recycled reef rock that was bleach cured (glued together with AF stone fix) and was fishless cycled using Fritz turbostart 900 and Dr Timms ammonia. This is my second reef tank so I am stumped with this as I was expecting the nitrates to go down. Any ideas??