Hey all, after gorging today, i told myself i would do a w/c on the 75, and add the Sea Chem Purigen i had to the Fluval on the tank ,,,,tank got clearer in a hr, stuff opened up more than b4, fish looked "happier". i do a w/c of about 30 g's every two weeks, and have not noticed this big of difference b4,,, what ya think ? this stuff as good as they say?tank is a reef w/ fishes,,,all were doing great b4, just noticed a lot of activity of the livestock (corals/fish)figger the tank had some levels of "non-good" levels in it ,and the purigen took it out. tank looked fine b4, (i'm taking a BUNCH of xenia to the LFS on Fri.). just wondering if anyone had experience with this product ,and their thoughts,,,