I am into my third aquarium set up and now have a 180 gallon aquarium that is having a battle with what I believe to be diatoms - brown algae everywhere. The fish are fine and the few coral I have added are relatively healthy. The tank has been up and running for almost a year. For the first time I did not use live rock but rather the dry rock that I saved from previous set ups. (Of course it was once live rock but moving from state to state did not allow me the ability to get everything transferred to new aquarium so I keep starting over. ) I am thinking that using dry rock and adding Dr. Tim's bacteria was a bad choice and I should have stuck to live rock. This is also the first time I am on a well water supply. I use RO water and just recently added a DI unit to the output. I have also started GFO even though my phosphate measure zero. Nitrates are also around zero ppm. Ammonia is zero and Alk, Ca, Mg are all in range. I use kalwasser for keep the pH at 8.2 and the Alk around 8.5 dkH. My patience is wearing thin as I am tired of siphoning out the diatom infested sand and brushing the diatoms from the rock and aquarium glass. Anything I am missing besides patience?