I was confused why there was chlorine in my tank but not my rodi, I then found out it’s one of the three major elements, then I was confused why so much silica in my tank and not in rodi ..... I did a 99 percent water change when I found out it was in my rodi water before I added a Silca buster media to rodi, I’m just surprised it’s still in my tank ...... I’ve had a few corals losing there skin recently and I just haven’t been able to pinpoint why was going on....,until yesterday morning! My fat and heavily fed blue hippo tang now has a taste for corals, he’ll be going up for sale very soon! If anyone wants to buy him with his rap sheet