Thanks a bunch for the post! I have been thinking I was doing something really wrong since I'm still fighting diatoms. I thought it was a "new" tank problem that went away a few weeks after cycling! I guess I need to stop fighting!

Does this sound like things are balanced in my tank? Phosphates are at 0 and nitrates at 2.5. I feed every other day, and have a 12hr photoperiod. I have to clean diatoms off my glass about every third day...