Hello, I currently am battling clarity problem with my 125 gal FOWLR. There is a brownish colour to the water and on the aragonite. There isn't much on the glass. I am guessing this is some sort of algae or diatoms? All param. are fine. I have tried changing bulbs, i have done water changes with RO water, filtered with a micro filter pad, added carbon. This hasn't solved the problem. The only thing that clears it up nicely is turning out the lights for a few days. But as soon as I return to turning the lights on the problem is back again. I am just about ready to give up. However, I love the hobby. Any suggestion would be greatly appreciated. Thanks.