I use many of Tailored Aquatic products.......have to say the most amazing one is his Nitrate Destroyer...I had, in excess of 100ppm (or the very very very darkest pink on the chart) and my tank is an SPS tank! All corals were fine except not very colorful and the growth was not great. I used the product per the instructions....had noticed an increase in color...growth etc but forgot to measure my Nitrates. Towards the end of the schedule I tested and was in the 10-25 area but was not done the full treatment.......I just tested and for the first time in any tank I have ZERO....!!!!!!!!!!! ZERO! So I measured again...and it really is ZERO! I have no nitrates detectable. I feed very heavily and have 3 tangs......so this stuff works....!HUGE thumbs up~