I only have a few sps frags in my tank, but I do dose fuel once a week, azox every couple days, essential elements and tech-I once a week. All my corals and anemones seem very happy. I dose everything based on the instructions on the label. The sps pieces do seem to have good PE, my red monti plate has a very clean white rim of new growth and has doubled in size on a monthly basis. I have a piece of spongeodes I broke a nub of on accident and in less than 3 weeks now you would never have known a piece broke off, along with the fresh growth.