I have been researching Marine Pure blocks and it seems to be a good alternative to live rock. Does anyone have any experience with this product? Does anyone know the ratio to use? I know of the old 1lb/gal for live rock. I would like to stick some Marine Pure in my sumo and remove some lr from my display, just wondering how much I can take out. FYI I have a mixed reef 40B with approx 7gal sump