I have a bad outbreak of Diatoms on a piece of LR that is on the top of my pile of LR. If i took that and flipped it upside down would that kill the diatoms since it will not get any light.
It would make it so you cant see them. I dont think that will make them disapear. They will disapear on their own as you do some PWC`s to diminish their fuel source. You are not using tap are you?
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Nope. Silicates (from tap water), Phospate (PO4), DOCs are all food for diatoms. Turning the rock over will not eliminate the problem, just make it unseen for a while. PWCs as Mike suggested are your best offense and defense.