I find that time has been my best remedy when dealing with diatoms. I occasionally softly stir the sand that it is on right before a water change then try to suck as much of it out as I can with the drain hose. I also recommend the use of RO/DI water instead of tap, although I do not know what you are using for your water changes.
Originally Posted by earlybird http:///forum/post/2616414
If you are using ro or rodi water and do regular water changes and don't over feed, the diatoms will go away all by themselves.
QFT