I get a light dusting of brown diatoms from time to time, but nothing major at all, and it usually is gone by morning thanks to the clean up critters. because of the size of the tank and relative ease of maintenance, I usually do a weekly 40% water change, major vacuum, and blow off the rocks, clean the filter, etc. (I enjoy working on it, obviously). I think the key is don't dose too much. I dose maybe up to the first two threads in the cap. I think as long as there's a little available at all times, and it all gets consumed, it should stay relatively balanced with proper upkeep. the recent explosion of pods and mysis are evidence to me that it is indeed getting consumed. Of course I understand that that also introduces a lot of organic matter into the system, but I feel it can be easily removed before it becomes a problem with the weekly changes/vacuuming.