I began to see nitrate reduction within a month, My P04 took forever. I finaly was able to bring them down with a combination of GFO, and Vodka. It still took months to get my phosphates under control. Im still in the battle, but atleast ive got it semi under control. Ive got some before pictures in one of my post somewhere here on RC. If i get a chance ill take an updated picture tomorrow. Its amazing how much my tank cleaned up.